Initial code add

.github/pull_request_template.md

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+Thank you for contributing to CSA! Please provide all details requested below prior to submitting your pull request
+(PR).
+
+# Important Information
+- We don't formalize coding standards for this project, but please try to use the existing code as a convention guide.
+- CSA and the Helm chart adhere to [Semantic Versioning](https://semver.org/spec/v2.0.0.html) - please be aware of this
+  when incrementing versions.
+- Releases of CSA and the Helm chart are managed independently of merging to `main` - a maintainer will prepare
+  release(s) for you post-merge.
+
+# Areas Affected by PR
+Please indicate what areas are affected by your PR (check all that apply):
+
+- [ ] CSA
+- [ ] Helm chart
+
+# Nature of PR
+Please indicate the nature of your PR (check all that apply):
+
+- [ ] New feature
+- [ ] Bug fix
+- [ ] Security
+- [ ] Other (please provide details within the description)
+
+# Issue Links
+Please link to any issues related to your PR, or indicate if not applicable.
+
+# Description
+Please provide a description of the change(s) contained within your PR here.
+
+# Checklist
+Please ensure you work through any of **applicable** items below prior to submitting your PR:
+
+## Commits
+- [ ] Commits are of logical units (to help us work through your changes)
+
+## Tests
+- [ ] New unit/integration tests are implemented
+- [ ] Existing unit/integration tests are updated
+- [ ] All unit/integration tests are passing
+
+## Sandbox Scripts
+- [ ] Sandbox scripts are updated
+
+## Docs
+- [ ] `README.md` is updated
+- [ ] `CHANGELOG.md` is updated
+
+## Helm Chart
+- [ ] New tests are implemented
+- [ ] Existing tests are updated
+- [ ] All tests are passing
+- [ ] `version` within `Chart.yaml` is incremented (only if changes made to CSA or the chart itself)
+- [ ] `appVersion` within `Chart.yaml` is incremented (only if changes made to CSA)
+- [ ] `README.md` is updated
+- [ ] `CHANGELOG.md` is updated

.github/workflows/codeql.yaml

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+name: CodeQL
+
+on:
+  pull_request:
+    branches: ["main"]
+  push:
+    branches:
+      - main
+  schedule:
+    - cron: '0 0 * * 6'
+
+jobs:
+  analyze:
+    name: Analyze
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+
+      - name: Initialize CodeQL
+        uses: github/codeql-action/init@v2
+        with:
+          languages: go
+          queries: security-extended
+
+      - name: Autobuild
+        uses: github/codeql-action/autobuild@v2
+
+      - name: Perform CodeQL Analysis
+        uses: github/codeql-action/analyze@v2

.github/workflows/release.yaml

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+name: Release
+
+on:
+  push:
+    tags:
+      - 'csa-*'
+
+jobs:
+  validate-tag:
+    name: Validate tag
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Validate tag
+        run: |
+          if ! [[ "$GITHUB_REF_NAME" =~ ^csa-[0-9]+.[0-9]+.[0-9]+$ ]]; then
+            echo "Tag does not match expected pattern - got $GITHUB_REF_NAME"
+            exit 1
+          fi
+
+  publish-docker-image:
+    name: Publish Docker image
+    runs-on: ubuntu-latest
+    needs: validate-tag
+
+    steps:
+      - name: Docker metadata
+        id: meta
+        uses: docker/metadata-action@v5
+        with:
+          images: expediagroup/container-startup-autoscaler
+          tags: |
+            type=match,pattern=csa-(.*),group=1
+
+      - name: Docker setup QEMU
+        uses: docker/setup-qemu-action@v3
+
+      - name: Docker setup buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Docker Hub login
+        uses: docker/login-action@v3
+        with:
+          username: ${{ secrets.DOCKER_HUB_USERNAME }}
+          password: ${{ secrets.DOCKER_HUB_PASSWORD }}
+
+      - name: Docker build and push
+        uses: docker/build-push-action@v5
+        with:
+          platforms: linux/amd64,linux/arm64
+          push: true
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}
+
+  publish-helm-chart:
+    name: Publish Helm chart
+    runs-on: ubuntu-latest
+    needs: publish-docker-image
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v3
+        with:
+          fetch-depth: 0
+
+      - name: Install Helm
+        uses: azure/setup-helm@v3
+        with:
+          version: v3.13.1
+
+      - name: Install chart-releaser
+        uses: helm/chart-releaser-action@v1.5.0
+        with:
+          install_only: true
+
+      - name: Run chart-releaser
+        env:
+          CR_TOKEN: "${{ secrets.GITHUB_TOKEN }}"
+          CR_RELEASE_NAME_TEMPLATE: "chart-{{ .Version }}"
+        run: |
+          owner=$(cut -d '/' -f 1 <<< "$GITHUB_REPOSITORY")
+          repo=$(cut -d '/' -f 2 <<< "$GITHUB_REPOSITORY")
+
+          git config user.name "$GITHUB_ACTOR"
+          git config user.email "$GITHUB_ACTOR@users.noreply.github.com"
+
+          rm -rf .cr-release-packages
+          rm -rf .cr-index
+          mkdir -p .cr-release-packages
+          mkdir -p .cr-index
+
+          cr package charts/container-startup-autoscaler
+
+          # https://github.com/helm/chart-releaser#create-github-releases-from-helm-chart-packages
+          cr upload -o "$owner" -r "$repo" -c "$(git rev-parse HEAD)" --skip-existing \
+                    --release-notes-file=releasenotes.md --make-release-latest=false
+
+          # https://github.com/helm/chart-releaser#create-the-repository-index-from-github-releases
+          cr index -o "$owner" -r "$repo" --push

.github/workflows/tests.yaml

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+name: Tests
+
+on:
+  pull_request:
+    branches: [ "main" ]
+
+jobs:
+  unit:
+    name: Run unit tests
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v3
+        with:
+          fetch-depth: 0
+
+      - name: Set up Go
+        uses: actions/setup-go@v4
+        with:
+          go-version: '1.21'
+
+      - name: Test
+        run: make test-run-unit
+
+  integration:
+    name: Run integration tests
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v3
+        with:
+          fetch-depth: 0
+
+      - name: Set up Go
+        uses: actions/setup-go@v4
+        with:
+          go-version: '1.21'
+
+      - name: Set up Kind
+        uses: helm/kind-action@v1.8.0
+        with:
+          install_only: true
+          version: v0.20.0
+          kubectl_version: v1.27.2
+
+      - name: Test
+        env:
+          MAX_PARALLELISM: 1 # Constrained to 2 CPUs on ubuntu-latest
+        run: make test-run-int-verbose
+
+  helm:
+    name: Run Helm tests
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v3
+        with:
+          fetch-depth: 0
+
+      - name: Test
+        run: make test-run-helm

.gitignore

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+.idea

CHANGELOG.md

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+# Changelog
+- Based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/).
+- This project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+## 0.1.0
+2024-01-05
+
+### Added
+- Initial version.
+
+### Helm Chart
+[1.0.0](charts/container-startup-autoscaler/CHANGELOG.md#100)
+
+### Kubernetes Compatibility
+| Kube Version | Compatible? | `In-place Update of Pod Resources` Maturity |
+|:------------:|:-----------:|:-------------------------------------------:|
+|     1.29     |     ✔️      |                    Alpha                    |
+|     1.28     |     ✔️      |                    Alpha                    |
+|     1.27     |      ❌      |                    Alpha                    |

CONTRIBUTING.md

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+# Contributing
+If you'd like to contribute code, please fork this GitHub repository, create a branch, and open a pull request. Please
+provide all details requested within the pull request template. A maintainer will review your submission.

Dockerfile

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+# Copyright 2024 Expedia Group, Inc.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+FROM --platform=$BUILDPLATFORM golang:1.21 AS build
+
+ARG BUILDPLATFORM
+ARG TARGETPLATFORM
+ARG TARGETOS
+ARG TARGETARCH
+RUN echo "Build platform: $BUILDPLATFORM, target platform: $TARGETPLATFORM, target OS: $TARGETOS, target arch: $TARGETARCH"
+
+RUN openssl s_client -showcerts -connect proxy.golang.org:443 </dev/null 2>/dev/null|openssl x509 -outform PEM > /usr/local/share/ca-certificates/goproxy.crt
+RUN update-ca-certificates
+
+WORKDIR /csa
+COPY go.mod go.sum ./
+RUN go mod download && go mod verify
+
+COPY cmd ./cmd
+COPY internal ./internal
+
+RUN CGO_ENABLED=0 GOOS=$TARGETOS GOARCH=$TARGETARCH go build -ldflags="-w -s" -o ./csa ./cmd/container-startup-autoscaler
+
+FROM --platform=$TARGETPLATFORM scratch
+
+COPY --from=build /csa/csa /csa/csa
+EXPOSE 8080/tcp
+EXPOSE 8081/tcp
+EXPOSE 8082/tcp
+ENTRYPOINT ["/csa/csa"]