Move package and container image builds to Nix #280

	---
	name: CI

	on:
	push:
	branches:
	- main
	tags:
	- 'v*'
	pull_request:

	jobs:
	formatting-and-quality:
	name: Formatting and Quality
	runs-on: ubuntu-latest

	steps:
	- uses: actions/checkout@v3
	- uses: cachix/install-nix-action@v20

	- name: Format
	run: nix build -L .#fmt

	- name: Clippy
	run: nix build -L .#clippy

	- name: Test
	run: nix build -L --no-sandbox .#test

	build:
	name: Build
	needs:
	- formatting-and-quality
	runs-on: ubuntu-latest

	strategy:
	matrix:
	package:
	- events-to-histogram
	- kafka-daq-report
	- simulator
	- stream-to-file
	- trace-archiver
	- trace-to-events

	steps:
	- uses: actions/checkout@v3
	- uses: cachix/install-nix-action@v20

	- name: Build
	run: nix build -L .#${{ matrix.package }}.package

	- name: Build and push container image
	if: ${{ github.ref_name == 'main' \|\| github.ref_type == 'tag' }}
	run: \|
	set -x

	local_cr="docker-archive://$(nix build .#${{ matrix.package }}.container-image --no-link --print-out-paths)"
	remote_cr="docker://ghcr.io/STFC-ICD-Research-and-Design/${{ matrix.package }}"

	skopeo copy --dest-creds="dannixon:${{ github.token }}" "$local_cr" "$remote_cr:${{ github.ref_name }}"
	skopeo copy --dest-creds="dannixon:${{ github.token }}" "$local_cr" "$remote_cr:${{ github.sha }}"
	if [[ "${{ github.ref_type }}" == 'tag' ]]; then
	skopeo copy --dest-creds="dannixon:${{ github.token }}" "$local_cr" "$remote_cr:latest"
	fi

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