try to use cache

.gitea/workflows/dockerfile_runner.yaml

@@ -16,6 +16,13 @@ jobs:
       - name: List files in the repository
         run: |
           ls ${{ gitea.workspace }}
+
+      - name: Cache pip
+        uses: actions/cache@v3
+        with:
+          path: /root/.cache/pip
+          key: pip-{{ hashFiles('requirements*.txt') }}
+
       - name: Set up Docker Buildx
         uses: docker/setup-buildx-action@v3
 
@@ -30,7 +37,10 @@ jobs:
         uses: docker/build-push-action@v6
         with:
           push: true
+          build-contexts: pip_cache=${{steps.vars.outputs.pip-dir}}
           tags: gitea.tryton.geeraert.eu/pi-ux-ce/django-python:latest
+          cache-from: type=gha
+          cache-to: type=gha,mode=max
       - name: drop the pod to force pulling the new image
         uses: actions-hub/kubectl@master
         env: