[ci] add release workflow #18

	name: Build Docker Image

	# Release on any git tag
	on:
	push:
	tags: ['*']

	jobs:
	build:
	runs-on: [self-hosted, linux, nixos]
	strategy:
	matrix:
	config:
	- blastoise
	outputs:
	cache-key: ${{ steps.build.outputs.cache-key }}
	steps:
	- uses: actions/checkout@v4
	with:
	# Checkout the triggered tag name
	ref: ${{ github.ref_name }}
	- name: Build docker image file
	id: build
	run: \|
	closure="$(nix build -L '.#t1.${{ matrix.config }}.release.docker-layers.final-image' --no-link --print-out-paths)"
	echo "path: $closure"
	cp "$closure/image.tar" /tmp/t1-image.tar
	echo "cache-key=$(nix hash file --base32 /tmp/t1-image.tar)" > $GITHUB_OUTPUT
	- name: Upload to cache
	uses: actions/cache/save@v4
	with:
	path: /tmp/t1-image.tar
	key: ${{ steps.build.outputs.cache-key }}

	upload:
	runs-on: ubuntu-latest
	needs: [build]
	steps:
	- name: Restore from cache
	uses: actions/cache/restore@v4
	id: cache
	with:
	path: /tmp/t1-image.tar
	fail-on-cache-miss: true
	key: ${{ needs.build.outputs.cache-key }}
	- name: Login to GHCR dot IO
	uses: docker/login-action@v2
	with:
	registry: ghcr.io
	username: ${{ github.actor }}
	password: ${{ secrets.GITHUB_TOKEN }}
	- name: Load and push
	run: \|
	docker load < /tmp/t1-image.tar
	docker tag t1/release:latest ghcr.io/chipsalliance/t1:latest
	docker push ghcr.io/chipsalliance/t1:latest

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