ci: get all history for a change log generator

.github/workflows/build.yml

@@ -71,6 +71,8 @@ jobs:
     steps:
       -
         uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
       -
         name: Set up Python 3.11
         uses: actions/setup-python@v4
@@ -84,22 +86,32 @@ jobs:
           invoke setup --devel --no-project
 
       -
-        name: Update changelog
+        name: Warn changelog out of sync
+        if: ${{ github.ref_type != 'tag' }}
         run: |
+
           invoke update-changes
           if ! git diff-index --quiet HEAD --
           then
-            git config user.name "$(git log -n 1 --pretty=format:%an)"
-            git config user.email "$(git log -n 1 --pretty=format:%ae)"
-            git add CHANGES.rst
-            git commit -m "docs: update CHANGES.rst"
-            invoke update-changes
-            git add CHANGES.rst
-            git commit --amend
-            git push
-            exit 253
+            echo '::warn file=CHANGES.rst,line=1,title=CHANGES.rst out of sync!::Expected invoke update-changes to have zero changes, got instead $(git diff CHANGES.rst).
+
+          If you make a tag from this, it *will* error out.'
+
           fi
 
+      -
+        name: Assert changelog in sync
+        if: ${{ github.ref_type == 'tag' }}
+        run: |
+          invoke update-changes
+          if ! git diff-index --quiet HEAD --
+          then
+            echo '::error file=CHANGES.rst,line=1,title=CHANGES.rst out of sync!::Update the changelog.
+          Suggest you fix that and delete the tag.'
+            exit 254
+          fi
+      -
+
   test_matrix:
     needs: [verify_style, verify_types, update-changelog]
     strategy: