ci: fixes to push-to-template workflw

.github/workflows/push-to-template.yaml

@@ -9,9 +9,25 @@ on:
 jobs:
   build:
     runs-on: ubuntu-latest
-    container: pandoc/latex
     steps:
-      - uses: actions/checkout@v2
+      - name: Get npm cache directory
+        id: npm-cache
+        run: |
+          echo "::set-output name=dir::$(npm config get cache)"
+      - uses: actions/cache@v2
+        with:
+          path: ${{ steps.npm-cache.outputs.dir }}
+          key: ${{ runner.os }}-node-${{ hashFiles('**/package-lock.json') }}
+          restore-keys: |
+            ${{ runner.os }}-node-
+      - name: Checkout code
+        uses: actions/checkout@v2
+      - name: Setup Node
+        uses: actions/setup-node@v1
+        with:
+          node-version: 12
+      - name: Install dependencies
+        run: npm ci
       - name: Build
         run:  npm run build
       - name: Pushes to another repository