Removed need for subprocess in action.yml

CHANGES.md

@@ -55,6 +55,8 @@
 - Vim plugin: prefix messages with `Black: ` so it's clear they come from Black (#3194)
 - Docker: changed to a /opt/venv installation + added to PATH to be available to
   non-root users (#3202)
+- GitHub Action: Updated usage of $GITHUB_ACTION_PATH to remove the nested python 
+  subprocess call for actions/main.py (#3226)
 
 ### Output
 

action.yml

@@ -29,25 +29,10 @@ runs:
   using: composite
   steps:
     - run: |
-        # Exists since using github.action_path + path to main script doesn't work because bash
-        # interprets the backslashes in github.action_path (which are used when the runner OS
-        # is Windows) destroying the path to the target file.
-        #
-        # Also semicolons are necessary because I can't get the newlines to work
-        entrypoint="import sys;
-        import subprocess;
-        from pathlib import Path;
-
-        MAIN_SCRIPT = Path(r'${GITHUB_ACTION_PATH}') / 'action' / 'main.py';
-
-        proc = subprocess.run([sys.executable, str(MAIN_SCRIPT)]);
-        sys.exit(proc.returncode)
-        "
-
         if [ "$RUNNER_OS" == "Windows" ]; then
-          echo $entrypoint | python
+          python $GITHUB_ACTION_PATH/action/main.py
         else
-          echo $entrypoint | python3
+          python3 $GITHUB_ACTION_PATH/action/main.py
         fi
       env:
         # TODO: Remove once https://github.com/actions/runner/issues/665 is fixed.