Cache some scummvm artifacts

.github/workflows/main.yml

@@ -28,12 +28,26 @@ jobs:
         with:
           submodules: true
           lfs: true
-
-      #- name: Cache scummvm 
-      #  uses: actions/cache@v2
-      #  with:
-      #    path: ./scummvm
-      #    key: scummvm
+
+      - name: Restore ScummVM cache
+        uses: actions/cache@v2
+        with:
+          path: |
+            ./scummvm/engines/engines.awk
+            ./scummvm/engines/detection_table.h
+            ./scummvm/engines/plugins_table.h
+            ./scummvm/config.h
+            ./scummvm/config.mk
+            ./scummvm/configure.stamp
+            ./scummvm/dists/emscripten/emsdk-3.1.8
+            ./scummvm/dists/emscripten/libs 
+            ./scummvm/**/*.[o,a]
+            ./scummvm/**/**/*.[o,a]
+            ./scummvm/**/**/**/*.[o,a]
+            ./scummvm/**/**/**/**/*.[o,a]
+            ./scummvm/**/**/**/**/**/*.[o,a]
+            ./scummvm/**/**/**/**/**/**/*.[o,a]
+          key: scummvm-cache
 
       - name: Build ScummVM 🔧
         run: |