CI: Remove caching and main branch limitation for setup action

Author: ByteOtter

.github/workflows/pytests.yml

@@ -18,20 +18,7 @@ jobs:
           fetch-depth: 2
 
       - name: Setup Gardenlinux
-        uses: gardenlinux/python-gardenlinux-lib/.github/actions/setup@main
-
-      - name: Activate caching based on lockfile
-        id: lockfile
-        run: |
-          if [ -f poetry.lock ]; then
-            echo "cache_type=poetry" >> $GITHUB_OUTPUT
-          elif [ -f requirements.txt ]; then
-            echo "cache_type=pip" >> $GITHUB_OUTPUT
-          else
-            # no lockfile present: create empty requirements.txt and use pip caching
-            touch requirements.txt
-            echo "cache_type=pip" >> $GITHUB_OUTPUT
-          fi
+        uses: ./.github/actions/setup
 
       - name: Install Poetry
         uses: snok/install-poetry@v1