build: allow rebuild docker image manually by github action

.github/workflows/build-docker-php.yml

@@ -3,6 +3,12 @@ name: Build and publish PHP Docker image
 on:
   release:
     types: [published]
+  workflow_dispatch:
+    inputs:
+      note:
+        description: 'Additional note (display on action summary)'
+        required: false
+        type: string
 
 env:
   REGISTRY: ghcr.io
@@ -41,3 +47,10 @@ jobs:
           push: true
           tags: ${{ steps.meta.outputs.tags }}
           labels: ${{ steps.meta.outputs.labels }}
+
+      - name: Update action summary
+        run: |
+          echo "" >> $GITHUB_STEP_SUMMARY # this is a blank line
+          if [[ "${{ inputs.note }}" != "" ]]; then
+            echo "> Note: ${{ inputs.note }}" >> $GITHUB_STEP_SUMMARY
+          fi