Update PR Docker workflow to remove branch filter

Removed branch restriction for pull request workflow.

Author: mxritzdev

.github/workflows/pr-docker.yaml

@@ -4,8 +4,6 @@ on:
   workflow_dispatch:
   pull_request_target:
       types: [opened, synchronize]
-      branches:
-        - master  # or your default branch
 
 env:
   GH_TOKEN: ${{secrets.GH_TOKEN}}