build: fix docker plugin build - fixes #8394

Signed-off-by: Anagh Kumar Baranwal <6824881+darthShadow@users.noreply.github.com>

.github/workflows/build_publish_docker_plugin.yml

@@ -7,14 +7,18 @@ name: Release Build for Docker Plugin
 on:
   release:
     types: [published]
+  workflow_dispatch:
+    inputs:
+      manual:
+        description: Manual run (bypass default conditions)
+        type: boolean
+        default: true
 
 jobs:
-
   build_docker_volume_plugin:
-        if: github.repository == 'rclone/rclone'
-        needs: build
-        runs-on: ubuntu-latest
+    if: inputs.manual || github.repository == 'rclone/rclone'
     name: Build docker plugin job
+    runs-on: ubuntu-latest
     steps:
       - name: Free some space
         shell: bash