Update apprenticeship-action.yml

previous commit ran but wouldn't move to next step as docker run was in the foreground, must be run in background.

.github/workflows/apprenticeship-action.yml

@@ -11,7 +11,7 @@ jobs:
       - name: Build the Docker image
         run: docker build -t liatrio-build .
       - name: run image
-        run: docker run liatrio-build
+        run: docker run -dp 127.0.0.1:80:80 liatrio-build
       - name: run tests
         uses: liatrio/github-actions/apprentice-action@808117af9b4a1e57c4cb79dbcb2d25de5ea3c68d