CI: address actions/cache warning and always upload cache.

.github/workflows/sub_buildWindows.yml

@@ -54,6 +54,7 @@ jobs:
       ## Have to use C:\ because not enough space on workspace drive
       builddir: C:/FC/build/release/
       libpackdir: C:/FC/libpack/
+      cacheKey: Windows
       ccachebindir: C:/FC/ccache/
       logdir: C:/logs/
       reportdir: C:/report/
@@ -90,14 +91,16 @@ jobs:
         with:
           libpackdir: ${{ env.libpackdir }}
       - name: Restore compiler cache
-        uses: actions/cache@5a3ec84eff668545956fd18022155c47e93e2684 # v4.2.3
+        id: cache-restore
+        if: always()
+        uses: actions/cache/restore@5a3ec84eff668545956fd18022155c47e93e2684 # v4.2.3
         with:
-          save-always: true
           path: ${{ env.CCACHE_DIR }}
-          key: FC-Windows-${{ github.ref }}-${{ github.run_id }}
+          key: FC-${{ env.cacheKey }}-${{ github.ref }}-${{ github.run_id }}
           restore-keys: |
-            FC-Windows-${{ github.ref }}-
-            FC-Windows-
+            FC-${{ env.cacheKey }}-${{ github.ref }}-
+            FC-${{ env.cacheKey }}-
+
       - name: Print Ccache statistics before build, reset stats and print config
         run: |
           . $env:ccachebindir\ccache -s
@@ -136,6 +139,15 @@ jobs:
       - name: FreeCAD CLI tests
         run: |
           . ${{ env.builddir }}\bin\FreeCADCmd -t 0 # 2>&1 | tee -filepath ${{ env.logdir }}\integrationTests.log
+
+      - name: Save Compiler Cache
+        id: cache-save
+        if: always()
+        uses: actions/cache/save@5a3ec84eff668545956fd18022155c47e93e2684 # v4.2.3
+        with:
+          path: ${{ env.CCACHE_DIR }}
+          key: FC-${{ env.cacheKey }}-${{ github.ref }}-${{ github.run_id }}
+
       - name: Upload logs
         if: always()
         uses: actions/upload-artifact@ea165f8d65b6e75b540449e92b4886f43607fa02 # v4.6.2