ci: cache node_modules across CI builds

Use actions/cache to cache all three node_modules directories
(root, apps/studio, apps/ui-kit) keyed on OS and yarn.lock hash.
Skip yarn install when cache hits.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

.github/workflows/studio-build-non-production.yml

@@ -89,10 +89,18 @@ jobs:
           node-version-file: '.nvmrc'
           cache: yarn
 
-      - name: Clean cache
-        run: yarn cache clean
+      - name: Cache node_modules
+        id: cache-node-modules
+        uses: actions/cache@v4
+        with:
+          path: |
+            node_modules
+            apps/studio/node_modules
+            apps/ui-kit/node_modules
+          key: node-modules-${{ matrix.os }}-${{ hashFiles('yarn.lock') }}
 
-      - name: Check dependencies
+      - name: Install dependencies
+        if: steps.cache-node-modules.outputs.cache-hit != 'true'
         run: "yarn install --frozen-lockfile --network-timeout 100000"
         env:
           npm_config_node_gyp: ${{ github.workspace }}${{ runner.os == 'Windows' && '\node_modules\node-gyp\bin\node-gyp.js' || '/node_modules/node-gyp/bin/node-gyp.js' }}

.github/workflows/studio-publish.yml

@@ -220,14 +220,22 @@ jobs:
         uses: samuelmeuli/action-snapcraft@v3
         if: matrix.os.type == 'linux'
 
-      - name: Clean cache
-        run: yarn cache clean --all
+      - name: Cache node_modules
+        id: cache-node-modules
+        uses: actions/cache@v4
+        with:
+          path: |
+            node_modules
+            apps/studio/node_modules
+            apps/ui-kit/node_modules
+          key: node-modules-${{ matrix.os.name }}-${{ hashFiles('yarn.lock') }}
 
       # FIXME (matthew) Windows needs retries. It sometimes fails to build
       # the native oracledb package.
       # But only sometimes. I cannot figure out why.
       # Someone should at some point.
       - name: yarn install (with retry)
+        if: steps.cache-node-modules.outputs.cache-hit != 'true'
         uses: nick-fields/retry@v2
         with:
           timeout_minutes: 20