Fix docker-image pipeline

pip isn't allowing a system-wide install anymore by default. Let's try
a user install instead.

.github/actions/check-prerelease/action.yml

@@ -12,7 +12,7 @@ runs:
   using: composite
   steps:
     - name: Install packaging
-      run: pip install packaging
+      run: pip install --user packaging
       shell: bash
 
     - name: Check if prerelease