Docker fix final 2 (#4049)

* Append correct python path if not present (only during testing)

* Add a bunch more debug info

* Display docker compose version

* More unit test fixes

* More debug info

* Ensure correct python path is included for docker build (only for testing)

* Remove debug statements

* Don't run docker workflow on PR

.github/workflows/docker.yaml

@@ -21,10 +21,6 @@ on:
     branches:
       - 'master'
 
-  pull_request:
-    branches:
-      - 'master'
-
 jobs:
 
   # Build the docker image
@@ -73,6 +69,7 @@ jobs:
           test -f data/secret_key.txt
       - name: Run Unit Tests
         run: |
+          docker-compose --version
           docker-compose run inventree-dev-server invoke test --disable-pty
           docker-compose down
       - name: Set up QEMU