use workflow for pushing tag test image

Author: gitricko

.github/workflows/docker-publish.yml

@@ -7,6 +7,12 @@ on:
     branches: [ main ]
   release:
     types: [ published ]
+  workflow_dispatch:
+    inputs:
+      manual_push:
+        description: 'Set to "yes" to push tag :test image to GHCR for testing before merging to main'
+        required: false
+        default: 'no'
 
 jobs:
 
@@ -34,7 +40,10 @@ jobs:
         
   push-to-ghcr:
     runs-on: ubuntu-latest
-    # if: github.ref == 'refs/heads/main'
+    # Run if on main branch, or if manual_push is yes from workflow_dispatch
+    if: >-
+      (github.ref == 'refs/heads/main') ||
+      (github.event_name == 'workflow_dispatch' && github.event.inputs.manual_push == 'yes')
     needs: build-test
     permissions:
       contents: read
@@ -65,12 +74,10 @@ jobs:
 
       - name: Set IMAGE_TAG for build-test
         run: |
-          if [ "${{ github.event_name }}" = "pull_request" ]; then
+          if [ "${{ github.event_name }}" = "workflow_dispatch" ] && [ "${{ github.event.inputs.manual_push }}" = "yes" ]; then
             echo "IMAGE_TAG=test" >> $GITHUB_ENV
           elif [ "${{ github.ref }}" = "refs/heads/main" ]; then
             echo "IMAGE_TAG=latest" >> $GITHUB_ENV
-          else
-            echo "IMAGE_TAG=${GITHUB_SHA::8}" >> $GITHUB_ENV
           fi
 
       - name: Extract metadata for Docker