Update visual regression test workflow

 - Node version set to 12 to match Jenkins
 - Remove operating system from cache keys
 - Bundle flag updated to use `--deployment`

.github/workflows/visual-regression-tests.yml

@@ -15,23 +15,23 @@ jobs:
       - uses: ruby/setup-ruby@v1
       - uses: actions/setup-node@v1
         with:
-          node-version: "14"
+          node-version: "12"
       - name: Check for cached Ruby gems
         uses: actions/cache@v2
         with:
           path: vendor/bundle
-          key: ${{ runner.os }}-gems-${{ hashFiles('**/Gemfile.lock') }}
-          restore-keys: ${{ runner.os }}-gems-
+          key: bundle-${{ hashFiles('**/Gemfile.lock') }}
+          restore-keys: bundle
       - name: Get Yarn cache directory path
         id: yarn-cache-directory-path
         run: echo "::set-output name=dir::$(yarn cache dir)"
       - name: Check for cached Yarn dependencies
         uses: actions/cache@v2
         with:
           path: ${{ steps.yarn-cache-directory-path.outputs.dir }}
-          key: ${{ runner.os }}-yarn-${{ hashFiles('**/yarn.lock') }}
-          restore-keys: ${{ runner.os }}-yarn-
-      - run: bundle install --jobs 4 --retry 3 --path vendor/bundle
+          key: yarn-${{ hashFiles('**/yarn.lock') }}
+          restore-keys: yarn-
+      - run: bundle install --jobs 4 --retry 3 --deployment
       - run: yarn install --frozen-lockfile
       - uses: percy/[email protected]
         with: