Use deep clone for GitHub actions

The full history is needed to do versioning properly with pbr.

Signed-off-by: Stephen Finucane <stephen@that.guru>

.github/workflows/ci.yaml

@@ -27,6 +27,9 @@ jobs:
     steps:
       - name: Checkout source code
         uses: actions/checkout@v2
+        # We need history to build the package
+        with:
+          fetch-depth: 0
       - name: Set up Python ${{ matrix.python }}
         uses: actions/setup-python@v2
         with:
@@ -42,6 +45,7 @@ jobs:
     steps:
       - name: Checkout source code
         uses: actions/checkout@v2
+        # We need history for release notes
         with:
           fetch-depth: 0
       - name: Set up Python 3.10
@@ -66,6 +70,7 @@ jobs:
     steps:
       - name: Checkout source code
         uses: actions/checkout@v2
+        # We need history to build the package
         with:
           fetch-depth: 0
       - name: Set up Python 3.10