[CI] Add cache creator (#20740)

.github/workflows/create-cache.yml

@@ -0,0 +1,36 @@
+name: Create CI cache
+
+on:
+  push:
+    branches:
+      - main
+
+jobs:
+  install:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v4
+      - uses: ruby/setup-ruby@v1
+        with:
+          bundler-cache: true
+      - name: Cache node_modules
+        uses: actions/cache@v4
+        with:
+          path: node_modules
+          key: ${{ runner.os }}-node-modules-v2-${{ hashFiles('**/yarn.lock') }}
+          restore-keys: ${{ runner.os }}-node-modules-v2-
+      - uses: actions/setup-node@v4
+        with:
+          node-version-file: '.nvmrc'
+          cache: yarn
+      - run: yarn install --immutable
+      - name: cache compiled assets exist
+        uses: actions/cache@v4
+        with:
+          fail-on-cache-miss: false
+          path: |
+            public/assets
+          key: ${{ runner.os }}-compiled-assets-v3-${{ hashFiles('app/assets/**', 'app/javascript/**', '**/package.json', '**/yarn.lock') }}
+          restore-keys: ${{ runner.os }}-compiled-assets-v3-
+      - run: bundle exec rails assets:precompile