added build backend image step w/ burnettk jbirddog

.github/workflows/backend_tests.yml

@@ -272,3 +272,45 @@ jobs:
         with:
           name: pr_number
           path: pr/
+
+  build-and-push-image:
+    if: github.ref_name == 'main' && ${{ github.event_name == 'push' }}
+    env:
+      REGISTRY: ghcr.io
+      IMAGE_NAME: sartography/spiffworkflow-backend
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      packages: write
+
+    steps:
+      - name: Get current date
+        id: date
+        run: echo "::set-output name=date::$(date +%s)"
+      - name: Checkout repository
+        uses: actions/checkout@v2
+
+      - name: Log in to the Container registry
+        uses: docker/login-action@f054a8b539a109f9f41c372932f1ae047eff08c9
+        with:
+          registry: ${{ env.REGISTRY }}
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Extract metadata (tags, labels) for Docker
+        id: meta
+        uses: docker/metadata-action@98669ae865ea3cffbcbaa878cf57c20bbf1c6c38
+        with:
+          images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
+
+      - name: Build and push Docker image
+        uses: docker/build-push-action@ad44023a93711e3deb337508980b4b5e9bcdc5dc
+        env:
+          # if we ever support more than main we will need to format the ref name
+          # like sub '/' with '-'
+          TAG: ${{ github.ref_name }}-${{ steps.date.outputs.date }}
+        with:
+          context: .
+          push: true
+          tags: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}:${{ env.TAG }}
+          labels: ${{ steps.meta.outputs.labels }}