Update .forgejo/workflows/container.yaml

Signed-off-by: xengi <forgejo@xengi.de>

.forgejo/workflows/container.yaml

@@ -35,3 +35,12 @@ jobs:
             --local context=./ \
             --local dockerfile=./ \
             --output type=image,name=${{ env.REGISTRY_URL }}/${{ env.FORGEJO_REPOSITORY }}:${{ env.REGISTRY_TAG }},push=true
+      - name: Send notification
+        if: ${{ failure() }}
+        run: |
+          curl -s \
+          --form-string "token=${{ secrets.PUSHOVER_API_TOKEN }}" \
+          --form-string "user=${{ secrets.PUSHOVER_USER_KEY }}" \
+          --form-string "message=Building archlinux-aur container failed." \
+          https://api.pushover.net/1/messages.json
+