[Chore] Add custom CI Docker image with Node.js 24, pnpm 10, and uv (#268)

This is meant to drastically speed up CI because it skips the lengthy installation.

Co-authored-by: jebus <lorsbach@envipath.com>
Reviewed-on: enviPath/enviPy#268
Co-authored-by: Tobias O <tobias.olenyi@envipath.com>
Co-committed-by: Tobias O <tobias.olenyi@envipath.com>

.gitea/workflows/ci.yaml

@@ -10,6 +10,11 @@ jobs:
   test:
     if: ${{ !contains(gitea.event.pull_request.title, 'WIP') }}
     runs-on: ubuntu-latest
+    container:
+      image: git.envipath.com/envipath/envipy-ci:latest
+      credentials:
+        username: ${{ secrets.CI_REGISTRY_USER }}
+        password: ${{ secrets.CI_REGISTRY_PASSWORD }}
 
     services:
       postgres:
@@ -78,10 +83,8 @@ jobs:
 
       - name: Run frontend tests
         run: |
-          source .venv/bin/activate
-          python manage.py test --tag frontend
+          .venv/bin/python manage.py test --tag frontend
 
       - name: Run Django tests
         run: |
-          source .venv/bin/activate
-          python manage.py test tests --exclude-tag slow --exclude-tag frontend
+          .venv/bin/python manage.py test tests --exclude-tag slow --exclude-tag frontend