Add cache restore-keys to always update cache

NOTE: See https://github.com/encounter/dtk-template-build/commit/9408cb2cdc65750f9099d58783adc2936c0831ba
zstd is added as a package to significantly improve cache update time.

.github.example/workflows/build.yml

@@ -31,7 +31,9 @@ jobs:
 
     # 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
+      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
@@ -45,7 +47,8 @@ jobs:
           build
           .ninja_deps
           .ninja_log
-        key: ${{ runner.os }}-${{ matrix.version }}
+        key: ${{ runner.os }}-${{ matrix.version }}-${{ github.sha }}
+        restore-keys: ${{ runner.os }}-${{ matrix.version }}-
 
     # Build the project
     - name: Build