ci: fetch full history when building to generate nightly changelog

Author: connorjclark

.github/workflows/build.yml

@@ -70,6 +70,8 @@ jobs:
       # Install dependencies.
       - name: git clone
         uses: actions/checkout@v3
+        with:
+          fetch-depth: 0
 
       - uses: actions/setup-python@v4
         with: