Create Actions job for uploading container image to Harbor

.github/dependabot.yml

@@ -0,0 +1,7 @@
+version: 2
+updates:
+  - package-ecosystem: "github-actions"
+    directory: "/"
+    schedule:
+      # Check for updates to GitHub Actions every weekday
+      interval: "daily"

.github/workflows/ci-build.yml

@@ -3,8 +3,9 @@ on:
   workflow_dispatch:
   pull_request:
   push:
+    # TODO - Change this to main before merging k8s-deployment into main
     branches:
-      - main
+      - k8s-deployment
 jobs:
   tests:
     runs-on: ubuntu-20.04
@@ -329,3 +330,37 @@ jobs:
       # different to SciGateway preprod
       - name: Diff SQL dumps
         run: diff -s ~/generator_script_dump_main.sql ~/generator_script_dump_1.sql
+
+  docker:
+    # This job triggers only if all the other jobs succeed and does different things depending on the context.
+    # The job builds the Docker image in all cases and also pushes the image to Harbor only if something is
+    # pushed to the k8s-deployment branch.
+    needs: [tests, linting, formatting, safety, generator-script-testing]
+    name: Docker
+    runs-on: ubuntu-20.04
+    steps:
+    - name: Check out repo
+      uses: actions/checkout@v2
+
+    - name: Login to Harbor
+      uses: docker/login-action@v1
+      with:
+        registry: harbor.stfc.ac.uk/datagateway
+        username: ${{ secrets.HARBOR_USERNAME }}
+        password: ${{ secrets.HARBOR_TOKEN }}
+
+    - name: Extract metadata (tags, labels) for Docker
+      id: meta
+      uses: docker/metadata-action@v3
+      with:
+        images: harbor.stfc.ac.uk/datagateway/datagateway-api
+
+    # TODO - Change github.ref to refs/heads/main before merging k8s-deployment into main
+    - name: ${{ github.event_name == 'push' && github.ref == 'refs/heads/k8s-deployment' && 'Build and push Docker image to Harbor' || 'Build Docker image' }}
+      uses: docker/build-push-action@v2
+      with:
+        context: .
+        # TODO - Change github.ref to refs/heads/main before merging k8s-deployment into main
+        push: ${{ github.event_name == 'push' && github.ref == 'refs/heads/k8s-deployment' }}
+        tags: ${{ steps.meta.outputs.tags }}
+        labels: ${{ steps.meta.outputs.labels }}