ci: add .forgejo/workflows/ci.yml for rmi-backend

Python CI: uv setup, ruff lint+format, mypy (warn), pytest (non-integration).
Runs on docker-x64 runner on Talos.
44 tests exist, now they will run in CI.

.forgejo/workflows/ci.yml

@@ -0,0 +1,49 @@
+name: CI
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+    branches: [main]
+
+jobs:
+  build:
+    runs-on: docker-x64
+    container:
+      image: python:3.11-slim
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Install system deps
+        run: |
+          apt-get update
+          apt-get install -y --no-install-recommends gcc libpq-dev curl git ca-certificates
+          rm -rf /var/lib/apt/lists/*
+
+      - name: Install uv
+        run: |
+          curl -LsSf https://astral.sh/uv/install.sh | sh
+          echo "$HOME/.local/bin" >> $GITHUB_PATH
+
+      - name: Setup Python
+        run: |
+          uv python install 3.11
+          uv venv --python 3.11 .venv
+
+      - name: Install dependencies
+        run: |
+          uv pip install --python .venv/bin/python -r requirements.txt
+          uv pip install --python .venv/bin/python -e ".[dev]"
+
+      - name: Lint (ruff)
+        run: source .venv/bin/activate && ruff check . --exit-non-zero-on-fix
+
+      - name: Format check (ruff)
+        run: source .venv/bin/activate && ruff format --check .
+
+      - name: Type check (mypy)
+        run: source .venv/bin/activate && mypy app/ --ignore-missing-imports || true
+        continue-on-error: true
+
+      - name: Test (pytest)
+        run: source .venv/bin/activate && pytest tests/ -x -q --tb=short -m "not integration"