Check if push to tag works

.github/workflows/release.yaml

@@ -0,0 +1,63 @@
+name: Release beta
+
+on:
+  push:
+    # tags: ['v[0-9.]+-beta.[0-9.]+']
+    tags:
+      - 'v*' # 'v[0-9.]+-experiment[0-9.]+'
+    # e.g. v0.9-experiment.0.0
+
+jobs:
+  release_beta:
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v2
+
+    - name: Set up Python 3.7
+      uses: actions/setup-python@v2
+      with:
+        python-version: 3.7
+
+    # - name: Upgrade pip
+    #   run: |
+    #     python3 -m pip install --upgrade pipenv
+
+    # # Pipenv doesn't support specifying global options.  See:
+    # #
+    # # https://github.com/pypa/pipenv/issues/2208
+    # #
+    # # We want to make sure that we're testing pure python dulwich,
+    # # since that's what the users will be using.
+    # #
+    # # We only want to install dulwich via the `-r requirements.txt`
+    # # method, since the presence of any non-default option causes pip
+    # # to avoid using wheels for all the other dependencies, which
+    # # slows down the build considerably (and breaks it on Windows).  I
+    # # don't think that any of our other current dependencies might
+    # # potentially use binary wheels, so in this case using wheels is
+    # # probably safe.  (Besides, AFAIK we didn't have any issues
+    # # specifically caused by a dependency other than dulwich (see
+    # # #138, so testing the other dependencies isn't a focus.)
+    # #
+    # # Unfortunately, I didn't manage to get process substitution
+    # # (`<()`) to work, within GitHub actions, so I'm writing
+    # # requirements.txt to a file.
+    # - name: Write dulwich version to requirements.txt
+    #   shell: bash
+    #   run: |
+    #     pipenv lock -r | sed -nE 's/(^dulwich==.+$)/\1 --global-option=--pure/p' > requirements.txt
+
+    # - name: Install pure dulwich from requirements.txt
+    #   run: |
+    #     pipenv run pip install -r requirements.txt
+
+    # - name: Install all other dependencies
+    #   shell: bash
+    #   run: |
+    #     pipenv install --dev
+
+    # # TODO Run each test separately?  (See: #145.)
+    # - name: Run tests
+    #   run: |
+    #     pipenv run mamba ./