CI rename action as test;use volume for uv cache

.forgejo/workflows/test.yaml

@@ -4,6 +4,8 @@ jobs:
     runs-on: container
     container:
       image: tiptop:5000/treetrail-backend-ci-base
+      volumes:
+      - "/root/.cache/uv:uv_cache"
     services:
       treetrail-database:
         image: treetrail-database

Containerfile.backend_ci_base

@@ -4,8 +4,4 @@ MAINTAINER philo email phil.dev@philome.mooo.com
 RUN apt update
 RUN apt install --no-install-recommends -y python-is-python3 python3-pip python3-venv nodejs git
 RUN pip install --break-system-packages uv
-
+RUN apt-get clean && rm -rf /var/lib/apt/lists/* && rm -rf /root/.cache
-RUN apt-get clean && \
-  rm -rf /var/lib/apt/lists/*
-
-RUN rm -rf /root/.cache