gci: Checkout entire history in PyPI build to ensure tags are there

setuptools_scm requires the ability to look up the latest tag.

.github/workflows/pypi.yml

@@ -3,7 +3,7 @@ name: Publish Python 🐍 distributions 📦 to PyPI and TestPyPI
 on: push
 jobs:
   deploy:
-    name: Build and publish ${{ matrix.package }} 🐍 
+    name: Build and publish ${{ matrix.package }} 🐍
     runs-on: ubuntu-20.04
     strategy:
       fail-fast: true
@@ -23,30 +23,38 @@ jobs:
             WORKDIR: contrib/pyln-spec/bolt4/
           - PACKAGE: pyn-bolt7
             WORKDIR: contrib/pyln-spec/bolt7/
-    steps: 
-    - uses: actions/checkout@master 
-    - name: Set up Python 3.7 
-      uses: actions/setup-python@v1 
-      with: 
-        python-version: 3.7 
-    - name: Install pypa/build 
-      run: >- 
+    steps:
+    - uses: actions/checkout@master
+      with:
+        # Need to fetch entire history in order to locate the version tag
+        fetch-depth: 0
+
+    - name: Set up Python 3.7
+      uses: actions/setup-python@v1
+      with:
+        python-version: 3.7
+
+    - name: Install pypa/build
+      run: >-
         python -m pip install build --user
+
     - name: Build a binary wheel and a source tarball
       env:
         WORKDIR: ${{ matrix.WORKDIR }}
       run: >-
         cd ${{ env.WORKDIR}} &&
         python -m build --sdist --wheel --outdir dist/ .
-    - name: Publish distribution 📦 to Test PyPI 
+
+    - name: Publish distribution 📦 to Test PyPI
       uses: pypa/gh-action-pypi-publish@master
       env:
         WORKDIR: ${{ matrix.WORKDIR }}
-      with: 
-        password: ${{ secrets.TEST_PYPI_API_TOKEN }} 
+      with:
+        password: ${{ secrets.TEST_PYPI_API_TOKEN }}
         repository_url: https://test.pypi.org/legacy/
         packages_dir: "${{ env.WORKDIR}}/dist"
         skip_existing: true
+
     - name: Publish distribution 📦 to PyPI
       if: startsWith(github.ref, 'refs/tags')
       uses: pypa/gh-action-pypi-publish@master