Merge pull request #21 from Tietokilta/docker-workflow

feat: add workflow for building docker image

.github/workflows/build.yml

@@ -0,0 +1,57 @@
+name: CI
+on:
+  push:
+  release:
+    types: [published]
+
+permissions:
+  id-token: write
+  contents: read
+env:
+  # Change this to upload the built image to your own organization.
+  docker_tag_prefix: ghcr.io/tietokilta
+jobs:
+  docker-build-and-push:
+    if: (github.event_name == 'push' && github.ref == 'refs/heads/main') || (github.event_name == 'release' && github.event.action == 'published')
+    strategy:
+      matrix:
+        project: [laskugeneraattori]
+    name: Push Docker image to GitHub Packages
+    runs-on: ubuntu-latest
+    permissions:
+      packages: write
+      contents: read
+    steps:
+      - name: Check out the repo
+        uses: actions/checkout@v4
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+      - name: Login to GHCR
+        uses: docker/login-action@v3
+        with:
+          registry: ghcr.io
+          username: ${{ github.repository_owner }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+      - name: Generate Docker metadata
+        id: meta
+        uses: docker/metadata-action@v5
+        with:
+          images: ${{env.docker_tag_prefix}}/${{matrix.project}}
+          tags: |
+            type=semver,pattern={{version}},enable=${{ github.ref_type == 'tag' }}
+            type=semver,pattern={{major}}.{{minor}},enable=${{ github.ref_type == 'tag' }}
+            type=raw,value=sha-${{github.sha}}
+            type=raw,value=latest,enable={{is_default_branch}}
+
+      - name: Push to GitHub Packages
+        uses: docker/build-push-action@v6
+        with:
+          context: .
+          push: true
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}
+          build-args: |
+            PROJECT=${{matrix.project}}
+            GIT_COMMIT_SHA=${{github.sha}}
+          cache-from: type=gha
+          cache-to: type=gha,mode=min