add ci steps to restore mtimes from commit history

Author: sneakers-the-rat

.circleci/config.yml

@@ -5,6 +5,11 @@ jobs:
       - image: cimg/python:3.13
     steps:
       - checkout
+      - run:
+          name: Restore mtimes from git history
+          command: |
+            sudo apt-get install git-restore-mtime
+            git restore-mtime
       - run:
           name: setup environment
           command: |

.github/workflows/build-book.yml

@@ -16,6 +16,13 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4
+        with:
+          fetch_depth: 0
+
+      - name: Restore mtimes from git history
+        run: |
+          sudo apt-get install git-restore-mtime
+          git restore-mtime
 
       - name: Setup Python
         uses: actions/setup-python@v5