Update docker-publish.yml add workflow flag (#6)

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:
 
@@ -79,4 +85,4 @@ jobs:
           tags: |
             ghcr.io/${{ env.LOWERCASE_REPO }}:latest
             ghcr.io/${{ env.LOWERCASE_REPO }}:${{ github.sha }}
-          labels: ${{ steps.meta.outputs.labels }}
+          labels: ${{ steps.meta.outputs.labels }}