Add TestPyPI publish workflow

Author: kgstorm

.github/workflows/publish-testpypi.yml

@@ -0,0 +1,51 @@
+name: Publish To TestPyPI
+
+on:
+  workflow_dispatch:
+
+permissions:
+  id-token: write
+  contents: read
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Set up Python
+        uses: actions/setup-python@v5
+        with:
+          python-version: "3.11"
+
+      - name: Build package
+        run: |
+          python -m pip install --upgrade pip build
+          python -m build
+
+      - name: Upload artifacts
+        uses: actions/upload-artifact@v4
+        with:
+          name: dist-artifacts
+          path: dist/*
+
+  publish:
+    runs-on: ubuntu-latest
+    needs: build
+    environment:
+      name: testpypi
+      url: https://test.pypi.org/p/classcharts-api
+
+    steps:
+      - name: Download artifacts
+        uses: actions/download-artifact@v4
+        with:
+          name: dist-artifacts
+          path: dist
+
+      - name: Publish package distributions to TestPyPI
+        uses: pypa/gh-action-pypi-publish@release/v1
+        with:
+          repository-url: https://test.pypi.org/legacy/