Add workflow_dispatch trigger to GitHub Actions build and push workflow

Author: itspooya

.github/workflows/build-and-push.yml

@@ -7,6 +7,7 @@ on:
     tags: [ 'v*.*.*' ]
   pull_request:
     branches: [ "main" ]
+  workflow_dispatch:
 
 env:
   # Use docker.io for Docker Hub if needed