validate_static: check Web Manifest JSON

.github/workflows/validate-static.yml

@@ -8,20 +8,20 @@ on:
 jobs:
   validate-static:
     runs-on: ubuntu-latest
-    
+
     env:
       VALIDATOR_VERSION: 20.3.16
-    
+
     steps:
     - uses: actions/checkout@v2
     - uses: actions/setup-node@v1
-    
+
     - name: Cache node modules
       uses: actions/cache@v1
       env:
         cache-name: cache-node-modules
       with:
-        path: ~/.npm 
+        path: ~/.npm
         key: ${{ runner.os }}-build-${{ env.cache-name }}-${{ hashFiles('**/package-lock.json') }}
 
     - name: Cache validator
@@ -31,7 +31,7 @@ jobs:
         path: vnu-runtime-image
         key: ${{ runner.os }}-validator-${{ env.VALIDATOR_VERSION }}
 
-    - run: sudo apt-get -y install libxml2-utils
+    - run: sudo apt-get -y install libxml2-utils yajl-tools
     - run: npm install
 
     - name: Download validatornu