ci: 🎡 cache node_modules in CI

.github/workflows/monorepo-validate.yaml

@@ -7,6 +7,11 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v2
+      - uses: actions/cache@v2
+        id: cache
+        with:
+          path: **/node_modules
+          key: ${{ runner.os }}-${{ hashFiles('**/yarn.lock') }}
       - uses: actions/setup-node@v1
         with:
           node-version: '12.x'
@@ -18,6 +23,11 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v2
+      - uses: actions/cache@v2
+        id: cache
+        with:
+          path: **/node_modules
+          key: ${{ runner.os }}-${{ hashFiles('**/yarn.lock') }}
       - uses: actions/setup-node@v1
         with:
           node-version: '12.x'
@@ -29,6 +39,11 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v2
+      - uses: actions/cache@v2
+        id: cache
+        with:
+          path: **/node_modules
+          key: ${{ runner.os }}-${{ hashFiles('**/yarn.lock') }}
       - uses: actions/setup-node@v1
         with:
           node-version: '12.x'
@@ -40,6 +55,11 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v2
+      - uses: actions/cache@v2
+        id: cache
+        with:
+          path: **/node_modules
+          key: ${{ runner.os }}-${{ hashFiles('**/yarn.lock') }}
       - uses: actions/setup-node@v1
         with:
           node-version: '12.x'