BC-147 - add dispatch job after build and push job for the main branch (

#74)

.github/workflows/main.yml

@@ -40,4 +40,22 @@ jobs:
           platforms: linux/amd64
           push: true
           tags: ghcr.io/${{ github.repository }}:${{ github.sha }}
-          labels: ${{ steps.docker_meta_img.outputs.labels }}
+          labels: ${{ steps.docker_meta_img.outputs.labels }}
+
+  dispatch:
+    runs-on: ubuntu-latest
+    needs:
+      - build_and_push
+    steps:
+      - uses: actions/checkout@v2
+      - name: Extract branch name
+        shell: bash
+        run: echo "##[set-output name=branch;]$(echo ${GITHUB_REF#refs/heads/})"
+        id: extract_branch
+      - name: Repository Dispatch
+        uses: peter-evans/repository-dispatch@v1
+        with:
+          token: ${{ secrets.REPO_ACCESS_TOKEN }}
+          repository: hpi-schul-cloud/dof_app_deploy
+          event-type: dev-deploy
+          client-payload: '{"branch": "${{ steps.extract_branch.outputs.branch}}" }'