add job for build and pushing images

.github/workflows/ci.yml

@@ -8,6 +8,8 @@ on:
 
 env:
   GO_VERSION: ^1.21.5
+  REGISTRY: ghcr.io
+  IMAGE_NAME: ${{ github.repository }}
 
 jobs:
   build_and_test:
@@ -28,3 +30,46 @@ jobs:
 
       - name: Test
         run: go test -v ./...
+
+  package:
+    name: Build and push image
+    runs-on: ubuntu-latest
+    needs: [build, test]
+    permissions:
+      contents: read
+      packages: write
+    steps:
+      - name: Check out code
+        uses: actions/checkout@v4
+
+      - name: Set up Pack
+        uses: buildpacks/github-actions/setup-pack@v5
+
+      - name: Login to GitHub Container Registry
+        uses: docker/login-action@v3
+        with:
+          registry: ${{ env.REGISTRY }}
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Extract metadata for images
+        id: meta
+        uses: docker/metadata-action@v5
+        with:
+          images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
+          tags: |
+            type=schedule
+            type=ref,event=branch
+            type=ref,event=tag
+            type=ref,event=pr
+            type=sha
+            type=sha,format=long
+
+      - name: Build and tag images
+        run: |
+          pack build ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }} \
+          --tag ${{ steps.meta.outputs.tags }} \
+          --builder gcr.io/buildpacks/builder:v1 \
+          --env GOOGLE_FUNCTION_SIGNATURE_TYPE=http \
+          --env GOOGLE_FUNCTION_TARGET=ModProxy
+          --publish