ci: add manual workflow trigger for testing

Author: evilrobot-01

.github/workflows/release-image.yml

@@ -8,6 +8,12 @@ on:
       - edited
       - prereleased
       - published
+  workflow_dispatch:
+    inputs:
+      tag:
+        description: "Tag to be used"
+        required: true
+        type: string
 env:
   IMAGE_NAME: useink/ci
 
@@ -38,6 +44,16 @@ jobs:
             ${{ env.IMAGE_NAME }}:master
             ${{ env.IMAGE_NAME }}:latest
 
+      - name: Build and push Docker image from manual trigger
+        if: ${{ github.event_name == 'workflow_dispatch' }}
+        uses: docker/build-push-action@v6
+        with:
+          context: .
+          file: ./ci/Dockerfile
+          push: true
+          tags: |
+            ${{ env.IMAGE_NAME }}:${{ github.event.inputs.tag }}
+
       # Store the version, stripping any v-prefix
       - name: Write release version
         if: ${{ github.event_name == 'release' }}