Add GitHub Actions workflow for deploying to TestPyPI

- Implemented a new GitHub Actions workflow named "Deploy to TestPyPI" in `.github/workflow/deploy-testpypi.yaml`.
- Configured the workflow to run on Ubuntu and set up Python environment with version 3.12.
- Set up Rye for caching dependencies and syncing with it.
- Built distribution packages using Rye and published them to TestPyPI.
- Added a token for authentication to TestPyPI in the workflow configuration.

Signed-off-by: urasakikeisuke <[email protected]>

.github/workflows/deploy-testpypi.yaml

@@ -0,0 +1,38 @@
+name: Deploy to TestPyPI
+
+on:
+  workflow_dispatch:
+
+jobs:
+  deploy:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+
+      - name: Set up Python
+        uses: actions/setup-python@v5
+        with:
+          python-version: "3.12"
+
+      - name: Set up Rye
+        uses: eifinger/setup-rye@v2
+        with:
+          enable-cache: true
+          github-token: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Sync with Rye
+        run: rye sync
+
+      - name: Build distribution packages
+        run: rye build --clean
+
+      - name: Publish to TestPyPI
+        run: >
+          rye publish
+            --yes
+            --verbose
+            --repository testpypi
+            --repository-url https://test.pypi.org/legacy/
+            --token ${{ secrets.TEST_PYPI_TOKEN }}