ci: Add test-pypi publish workflow

.github/workflows/publish-to-test-pypi.yml

@@ -0,0 +1,58 @@
+name: Publish Python distribution to PyPI and TestPyPI
+
+on: push
+
+jobs:
+  build:
+    name: Build distribution
+    runs-on: ubuntu-latest
+    steps:
+    - name: Check out
+      uses: actions/checkout@v4
+      with:
+        fetch-depth: 1
+    - name: Set up python
+      uses: actions/setup-python@v5
+      with:
+        python-version: "3.10"
+    - name: Install Poetry
+      uses: snok/install-poetry@v1
+      with:
+        virtualenvs-in-project: true
+    - name: Load cached venv
+      id: cached-poetry-dependencies
+      uses: actions/cache@v4
+      with:
+        path: .venv
+        key: venv-${{ runner.os }}-3.10-${{ hashFiles('poetry.lock') }}
+    - name: Build wheel and tarball
+      run: poetry build --no-interaction
+    - name: Store the distribution packages
+      uses: actions/upload-artifact@v4
+      with:
+        name: python-package-distributions
+        path: dist/
+
+  publish-to-testpypi:
+    name: Publish Python distribution to TestPyPI
+    needs:
+    - build
+    runs-on: ubuntu-latest
+
+    environment:
+      name: testpypi
+      url: https://test.pypi.org/p/keymap-drawer
+
+    permissions:
+      id-token: write  # IMPORTANT: mandatory for trusted publishing
+
+    steps:
+    - name: Download all the dists
+      uses: actions/download-artifact@v4
+      with:
+        name: python-package-distributions
+        path: dist/
+    - name: Publish distribution to TestPyPI
+      uses: pypa/gh-action-pypi-publish@release/v1
+      with:
+        repository-url: https://test.pypi.org/legacy/