Fix Gitea Actions: drop custom job container, use setup-python

The python:3.11-slim job container lacked a Node.js runtime, so the
runner couldn't exec actions/checkout inside it. Run jobs on the
default runner image instead and pin Python via actions/setup-python.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

.gitea/workflows/ci.yml

@@ -8,70 +8,65 @@ jobs:
   lint:
     name: lint:ruff
     runs-on: ubuntu-latest
-    container: python:3.11-slim
     steps:
       - uses: actions/checkout@v4
-      - name: Cache pip
-        uses: actions/cache@v4
+      - uses: actions/setup-python@v5
         with:
-          path: ~/.cache/pip
-          key: pip-${{ hashFiles('pyproject.toml') }}
+          python-version: "3.11"
+          cache: pip
+          cache-dependency-path: pyproject.toml
       - run: pip install -e ".[dev,plotting]"
       - run: ruff check gallery plotstyle tests
 
   format:
     name: format:ruff
     runs-on: ubuntu-latest
-    container: python:3.11-slim
     steps:
       - uses: actions/checkout@v4
-      - name: Cache pip
-        uses: actions/cache@v4
+      - uses: actions/setup-python@v5
         with:
-          path: ~/.cache/pip
-          key: pip-${{ hashFiles('pyproject.toml') }}
+          python-version: "3.11"
+          cache: pip
+          cache-dependency-path: pyproject.toml
       - run: pip install -e ".[dev,plotting]"
       - run: ruff format --check gallery plotstyle tests
 
   typecheck:
     name: typecheck:ty
     runs-on: ubuntu-latest
-    container: python:3.11-slim
     steps:
       - uses: actions/checkout@v4
-      - name: Cache pip
-        uses: actions/cache@v4
+      - uses: actions/setup-python@v5
         with:
-          path: ~/.cache/pip
-          key: pip-${{ hashFiles('pyproject.toml') }}
+          python-version: "3.11"
+          cache: pip
+          cache-dependency-path: pyproject.toml
       - run: pip install -e ".[dev,plotting]"
       - run: ty check gallery plotstyle
 
   vulnerabilities:
     name: vulnerabilities:pip-audit
     runs-on: ubuntu-latest
-    container: python:3.11-slim
     steps:
       - uses: actions/checkout@v4
-      - name: Cache pip
-        uses: actions/cache@v4
+      - uses: actions/setup-python@v5
         with:
-          path: ~/.cache/pip
-          key: pip-${{ hashFiles('pyproject.toml') }}
+          python-version: "3.11"
+          cache: pip
+          cache-dependency-path: pyproject.toml
       - run: pip install -e ".[dev,plotting]"
       - run: pip-audit
 
   test:
     name: test:pytest
     runs-on: ubuntu-latest
-    container: python:3.11-slim
     needs: [lint, format, typecheck, vulnerabilities]
     steps:
       - uses: actions/checkout@v4
-      - name: Cache pip
-        uses: actions/cache@v4
+      - uses: actions/setup-python@v5
         with:
-          path: ~/.cache/pip
-          key: pip-${{ hashFiles('pyproject.toml') }}
+          python-version: "3.11"
+          cache: pip
+          cache-dependency-path: pyproject.toml
       - run: pip install -e ".[dev,plotting]"
       - run: python -m pytest tests/ -v

CLAUDE.md

@@ -133,6 +133,6 @@ The frontend is vanilla ES modules — no build step. `assets/js/main.js` import
 
 ### Deployment
 
-The project ships a `Dockerfile` plus `docker-compose.yml` (a `generator` service that runs `gallery generate` on an interval, and an `nginx`-based `web` service serving the output — see `deploy/entrypoint.sh` and `deploy/nginx.conf`). This suits a dedicated VM/server you fully control. CI (`.gitea/workflows/ci.yml`, run via Gitea Actions) runs `ruff check`, `ruff format --check`, `ty check`, `pip-audit`, and pytest directly against a `python:3.11-slim` image — no container build/publish in CI. For local development the `.venv` (or `uv`) is sufficient.
+The project ships a `Dockerfile` plus `docker-compose.yml` (a `generator` service that runs `gallery generate` on an interval, and an `nginx`-based `web` service serving the output — see `deploy/entrypoint.sh` and `deploy/nginx.conf`). This suits a dedicated VM/server you fully control. CI (`.gitea/workflows/ci.yml`, run via Gitea Actions) runs `ruff check`, `ruff format --check`, `ty check`, `pip-audit`, and pytest on the default runner image with Python 3.11 via `actions/setup-python` — no container build/publish in CI. For local development the `.venv` (or `uv`) is sufficient.
 
 On shared HPC login nodes without a Docker daemon (e.g. KIT ETP, where `public_html` is already auto-served) use a plain venv install plus a `systemd --user` timer instead — see `deploy/systemd/README.md`.

deploy/systemd/README.md

@@ -58,5 +58,5 @@ usable there at all, fall back to a crontab entry instead:
 where you control a dedicated VM/server and need to serve the output yourself.
 On the ETP login nodes there's no Docker daemon (Apptainer/Singularity only),
 and `public_html` is already auto-served — running your own nginx there would
-be redundant. Docker is still used for CI (`.gitea/workflows/ci.yml`) and
-remains a fine option for anyone deploying this on their own server.
+be redundant. It remains a fine option for anyone deploying this on their own
+server.