Publish docker image in GHCR (#21)

.github/workflows/build.yml

@@ -12,6 +12,22 @@ jobs:
     steps:
       - uses: actions/checkout@v2
 
+      - name: Determine Version
+        run: |
+          # determine version from tag
+          export VERSION=$(echo "${GITHUB_REF}" | cut -d "/" -f3)
+          if [[ $VERSION != v* ]]
+          then
+            export VERSION=""
+            echo "Building version-less (main or feature branch)"
+          else
+            # make version more Docker-friendly by dropping the 'v'
+            export VERSION=${VERSION:1:${#VERSION}}
+            echo "Building as ${VERSION}"
+          fi
+          echo "##[set-output name=version;]$VERSION"
+        id: determine_version
+
       - name: Set up Go
         uses: actions/setup-go@v2
         with:
@@ -30,3 +46,14 @@ jobs:
         with:
           files: coverage.cov
           flags: unittests
+
+      - name: Push Release Docker Image
+        run: |
+          echo "${{ secrets.GITHUB_TOKEN }}" | docker login ghcr.io -u ${{ github.actor }} --password-stdin
+          docker build -t ghcr.io/oxisto/oauth2go:latest .
+          docker tag ghcr.io/oxisto/oauth2go:latest ghcr.io/oxisto/oauth2go:$VERSION
+          docker push ghcr.io/oxisto/oauth2go:$VERSION
+          docker push ghcr.io/oxisto/oauth2go:latest
+        if: startsWith(github.ref, 'refs/tags/v')
+        env:
+          VERSION: ${{ steps.determine_version.outputs.version }}

Dockerfile

@@ -0,0 +1,17 @@
+FROM golang as builder
+
+WORKDIR /build
+
+ADD go.mod .
+ADD go.sum .
+
+ADD . .
+
+# Disable cgo because our final image will be alpine and will not have the same C stdlib
+RUN CGO_ENABLED=0 go build cmd/server/server.go
+
+FROM alpine
+
+COPY --from=builder /build/server /
+
+CMD ["./server"]