Upgrade dtk-template

.github/workflows/build.yml

@@ -22,15 +22,33 @@ jobs:
     - name: Checkout
       uses: actions/checkout@v4
       with:
+        fetch-depth: 0
         submodules: recursive
 
     # Set Git config
     - name: Git config
       run: git config --global --add safe.directory "$GITHUB_WORKSPACE"
 
+    # Normalize file mod times
+    - name: Restore timestamps
+      run: |
+        uv run https://raw.githubusercontent.com/MestreLion/git-tools/refs/tags/v2022.12/git-restore-mtime \
+            --merge --commit-time
+
     # Copy the original files to the workspace
     - name: Prepare
-      run: cp -R /orig .
+      run: cp -a /orig .
+
+    # Restore cached files
+    - name: Cache build
+      uses: actions/cache@v4
+      with:
+        path: |
+          build
+          .ninja_deps
+          .ninja_log
+        key: ${{ runner.os }}-${{ matrix.version }}-${{ github.sha }}
+        restore-keys: ${{ runner.os }}-${{ matrix.version }}-
 
     # Build the project
     - name: Build