ci: added manual dispatch

.github/workflows/docker-image.yml

@@ -11,29 +11,26 @@ on:
     branches:
       - 'master'
       - 'trunk'
+  workflow_dispatch:
 
 jobs:
   docker:
     runs-on: ubuntu-latest
     steps:
-      -
-        name: Checkout
+      - name: Checkout
         uses: actions/checkout@v2
-      -
-        name: Docker meta
+      - name: Docker meta
         id: meta
         uses: docker/metadata-action@v3
         with:
           images: ${{ vars.DOCKERHUB_TEMPLATE }}
-      -
-        name: Login to DockerHub
+      - name: Login to DockerHub
         if: github.event_name != 'pull_request'
         uses: docker/login-action@v1
         with:
           username: ${{ secrets.DOCKERHUB_USERNAME }}
           password: ${{ secrets.DOCKERHUB_TOKEN }}
-      -
-        name: Build and push
+      - name: Build and push
         uses: docker/build-push-action@v2
         with:
           context: .