Add github workflows

Signed-off-by: Yury Tsarev <yury@upbound.io>

.github/workflows/ci.yaml

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+name: CI
+
+on:
+  push:
+    branches:
+      - main
+      - release-*
+  workflow_dispatch: {}
+
+env:
+  XPKG_ACCESS_ID: ${{ secrets.XPKG_ACCESS_ID }}
+
+jobs:
+  detect-noop:
+    runs-on: ubuntu-20.04
+    outputs:
+      noop: ${{ steps.noop.outputs.should_skip }}
+    steps:
+      - name: Detect No-op Changes
+        id: noop
+        uses: fkirc/skip-duplicate-actions@v2.0.0
+        with:
+          github_token: ${{ secrets.GITHUB_TOKEN }}
+          paths_ignore: '["**.md", "**.png", "**.jpg"]'
+          do_not_skip: '["workflow_dispatch", "schedule", "push"]'
+
+  publish-artifacts:
+    runs-on: ubuntu-20.04
+    needs: detect-noop
+    if: needs.detect-noop.outputs.noop != 'true'
+
+    steps:
+      - name: Setup QEMU
+        uses: docker/setup-qemu-action@v1
+        with:
+          platforms: all
+
+      - name: Setup Docker Buildx
+        uses: docker/setup-buildx-action@v1
+        with:
+          version: ${{ env.DOCKER_BUILDX_VERSION }}
+          install: true
+
+      - name: Checkout
+        uses: actions/checkout@v2
+        with:
+          submodules: true
+
+      - name: Fetch History
+        run: git fetch --prune --unshallow
+
+      - name: Build Artifacts
+        run: make -j2 build.all
+        env:
+          # We're using docker buildx, which doesn't actually load the images it
+          # builds by default. Specifying --load does so.
+          BUILD_ARGS: "--load"
+
+      - name: Publish Artifacts to GitHub
+        uses: actions/upload-artifact@v2
+        with:
+          name: output
+          path: _output/**
+
+      - name: Login to Upbound
+        uses: docker/login-action@v1
+        if: env.XPKG_ACCESS_ID != ''
+        with:
+          registry: xpkg.upbound.io
+          username: ${{ secrets.XPKG_ACCESS_ID }}
+          password: ${{ secrets.XPKG_TOKEN }}
+
+      - name: Publish Artifacts
+        run: make -j2 publish BRANCH_NAME=${GITHUB_REF##*/}

.github/workflows/e2e.yaml

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+name: End to End Testing
+
+on:
+  issue_comment:
+    types: [created]
+
+jobs:
+  e2e:
+    uses: upbound/uptest/.github/workflows/pr-comment-trigger.yml@main
+    with:
+      package-type: configuration
+    secrets:
+      UPTEST_CLOUD_CREDENTIALS: ${{ secrets.UPTEST_CLOUD_CREDENTIALS }}

.github/workflows/tag.yml

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+name: Tag
+
+on:
+  workflow_dispatch:
+    inputs:
+      version:
+        description: 'Release version (e.g. v0.1.0)'
+        required: true
+      message:
+        description: 'Tag message'
+        required: true
+
+jobs:
+  create-tag:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+
+      - name: Create Tag
+        uses: negz/create-tag@v1
+        with:
+          version: ${{ github.event.inputs.version }}
+          message: ${{ github.event.inputs.message }}
+          token: ${{ secrets.GITHUB_TOKEN }}