github/workflows: move storybook deploy to separate workflow

.github/workflows/frontend.yml

@@ -3,11 +3,6 @@ name: Frontend CI
 on:
   pull_request:
     types: [opened, reopened, edited, synchronize]
-  push:
-    branches:
-      - master
-    paths:
-      - 'packages/core/src/**'
 
 jobs:
   build:
@@ -47,23 +42,5 @@ jobs:
       - run: yarn lint
       - run: yarn build
       - run: yarn test
-
-  deploy-storybook:
-    if: github.event_name == 'push' && github.ref == 'refs/heads/master'
-    runs-on: ubuntu-latest
-
-    strategy:
-      matrix:
-        node-version: [12.x]
-    steps:
-      - uses: actions/checkout@v2
-      - name: build storybook
-        run: |
-          yarn install
-          yarn workspace storybook build-storybook
-      - name: deploy gh-pages
-        uses: JamesIves/github-pages-deploy-action@3.4.2
-        with:
-          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
-          BRANCH: gh-pages
-          FOLDER: packages/storybook/dist
+      - name: verify storybook
+        run: yarn workspace storybook build-storybook

.github/workflows/storybook-deploy.yml

@@ -0,0 +1,50 @@
+name: Deploy Storybook
+
+on:
+  push:
+    branches:
+      - master
+    paths:
+      - '.github/workflows/storybook-deploy.yml'
+      - 'packages/storybook/**'
+      - 'packages/core/src/**'
+
+jobs:
+  deploy-storybook:
+    runs-on: ubuntu-latest
+
+    strategy:
+      matrix:
+        node-version: [12.x]
+    steps:
+      - uses: actions/checkout@v2
+      - name: find location of global yarn cache
+        id: yarn-cache
+        run: echo "::set-output name=dir::$(yarn cache dir)"
+      - name: cache global yarn cache
+        uses: actions/cache@v1
+        with:
+          path: ${{ steps.yarn-cache.outputs.dir }}
+          key: ${{ runner.os }}-yarn-${{ hashFiles('**/yarn.lock') }}
+          restore-keys: |
+            ${{ runner.os }}-yarn-
+      - name: cache node_modules
+        uses: actions/cache@v1
+        with:
+          path: node_modules
+          key: ${{ runner.os }}-modules-${{ hashFiles('yarn.lock') }}
+
+      - name: use node.js ${{ matrix.node-version }}
+        uses: actions/setup-node@v1
+        with:
+          node-version: ${{ matrix.node-version }}
+          registry-url: https://registry.npmjs.org/ # Needed for auth
+      - run: yarn install
+      - name: build storybook
+        run: yarn workspace storybook build-storybook
+      - name: deploy storybook to gh-pages
+        uses: JamesIves/github-pages-deploy-action@3.4.2
+        with:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          BRANCH: gh-pages
+          FOLDER: packages/storybook/dist