set emsdk cache folder

Author: dschuff

.github/actions/prepare-for-tests/action.yml

@@ -10,6 +10,7 @@ runs:
       uses: emscripten-core/setup-emsdk@v16
       with:
         version: tot
+        actions-cache-folder: 'emsdk-install'
 
     - name: Attach workspace
       uses: actions/download-artifact@v4

.github/workflows/build-and-test-linux.yml

@@ -65,6 +65,7 @@ jobs:
         uses: emscripten-core/setup-emsdk@v16
         with:
           version: tot
+          actions-cache-folder: 'emsdk-install'
 
       - name: Set EM_CONFIG
         run: |