ci: Add pipeline for test PyPI

.github/workflows/release-testpypi.yml

@@ -0,0 +1,60 @@
+name: Release (TestPyPI)
+
+on:
+  workflow_dispatch:
+
+jobs:
+  build:
+    name: Build sdist and wheel
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Set up uv
+        uses: astral-sh/setup-uv@v5
+        with:
+          enable-cache: true
+
+      - name: Set up Python
+        run: uv python install 3.12
+
+      - name: Show package version
+        run: |
+          VERSION="$(uv run python -c 'import tomllib; print(tomllib.loads(open("pyproject.toml","rb").read().decode())["project"]["version"])')"
+          echo "Publishing version: ${VERSION}"
+          echo "::notice title=TestPyPI version::${VERSION}"
+
+      - name: Build
+        run: uv build
+
+      - name: Validate distributions
+        run: uvx twine check dist/*
+
+      - name: Upload distributions
+        uses: actions/upload-artifact@v4
+        with:
+          name: dist-testpypi
+          path: dist/
+          retention-days: 7
+
+  publish:
+    name: Publish to TestPyPI
+    needs: build
+    runs-on: ubuntu-latest
+    environment:
+      name: testpypi
+      url: https://test.pypi.org/p/datamasque-python
+    permissions:
+      id-token: write
+      contents: read
+    steps:
+      - name: Download distributions
+        uses: actions/download-artifact@v4
+        with:
+          name: dist-testpypi
+          path: dist/
+
+      - name: Publish to TestPyPI
+        uses: pypa/gh-action-pypi-publish@release/v1
+        with:
+          repository-url: https://test.pypi.org/legacy/