ci: adopt yarn 4 caching and consolidated installs

Update GitHub Actions workflows for the Yarn 4 + workspaces world:

- check-pr.yml, release.yml, sample-distribution.yml: add
  `cache: 'yarn'` + `cache-dependency-path: 'yarn.lock'` to every
  actions/setup-node@v6 invocation so the workflows hit the
  .yarn/cache between runs. sdk-size-metrics.yml already had this.

- check-pr.yml, release.yml: replace `yarn lerna-workspaces run lint`
  with the plain `yarn lint` script (which forwards to the SDK
  workspace) -- lerna is gone.

- check-pr.yml: replace `cd package && yarn test:typecheck` with
  `yarn workspace stream-chat-react-native-core test:typecheck` for
  consistency with the rest of the workflow.

- changelog-preview.yml: collapse the four sequential
  `yarn --frozen-lockfile` / `yarn` invocations (root, package/,
  native-package/, examples/SampleApp/) into a single
  `yarn install --immutable` at the workspace root. Move the
  setup-node step after checkout (where it belongs) and drop the
  pre-checkout duplicate.

- sample-distribution.yml: reorder checkout to run before
  setup-node so the cache step can find yarn.lock.

Author: oliverlaz

.github/workflows/changelog-preview.yml

@@ -13,12 +13,6 @@ jobs:
       matrix:
         node-version: [ 24.x ]
     steps:
-      - name: Use Node.js ${{ matrix.node-version }}
-        uses: actions/setup-node@v6
-        with:
-          node-version: ${{ matrix.node-version }}
-      - name: Install Linux build tools
-        run: sudo apt-get update && sudo apt-get install -y build-essential
       - uses: actions/checkout@v6
         with:
           ref: develop
@@ -31,15 +25,12 @@ jobs:
         with:
           node-version: ${{ matrix.node-version }}
           registry-url: 'https://registry.npmjs.org'
+          cache: 'yarn'
+          cache-dependency-path: 'yarn.lock'
+      - name: Install Linux build tools
+        run: sudo apt-get update && sudo apt-get install -y build-essential
       - name: Installation
-        run: |
-          yarn --frozen-lockfile
-          cd package/
-          yarn --frozen-lockfile
-          cd native-package/
-          yarn
-          cd ../../examples/SampleApp/
-          yarn
+        run: yarn install --immutable
 
       - name: Generate Changelog
         id: generate_changelog
@@ -54,7 +45,7 @@ jobs:
 
             echo "Changelog file ready! Setting up outputs"
             CHANGELOG_PREVIEW=$(cat NEXT_RELEASE_CHANGELOG.md)
-          
+
             CHANGELOG_PREVIEW_ESCAPED="${CHANGELOG_PREVIEW//'%'/'%25'}"
             CHANGELOG_PREVIEW_ESCAPED="${CHANGELOG_PREVIEW_ESCAPED//$'\n'/'%0A'}"
             CHANGELOG_PREVIEW_ESCAPED="${CHANGELOG_PREVIEW_ESCAPED//$'\r'/'%0D'}"

.github/workflows/check-pr.yml

@@ -23,13 +23,15 @@ jobs:
         uses: actions/setup-node@v6
         with:
           node-version: ${{ matrix.node-version }}
+          cache: 'yarn'
+          cache-dependency-path: 'yarn.lock'
       - name: Install Linux build tools
         run: sudo apt-get update && sudo apt-get install -y build-essential
       - name: Install && Build - SDK and Sample App
         uses: ./.github/actions/install-and-build-sdk
       - name: Lint
-        run: yarn lerna-workspaces run lint
+        run: yarn lint
       - name: Typecheck tests
-        run: cd package && yarn test:typecheck
+        run: yarn workspace stream-chat-react-native-core test:typecheck
       - name: Test
         run: yarn test:coverage

.github/workflows/release.yml

@@ -31,6 +31,8 @@ jobs:
         with:
           node-version: ${{ matrix.node-version }}
           registry-url: 'https://registry.npmjs.org'
+          cache: 'yarn'
+          cache-dependency-path: 'yarn.lock'
       - name: Install Linux build tools
         run: sudo apt-get update && sudo apt-get install -y build-essential
 
@@ -43,7 +45,7 @@ jobs:
         uses: ./.github/actions/install-and-build-sdk
 
       - name: Lint
-        run: yarn lerna-workspaces run lint
+        run: yarn lint
 
       - name: Test
         if: github.ref == 'refs/heads/develop'

.github/workflows/sample-distribution.yml

@@ -23,11 +23,13 @@ jobs:
         uses: webfactory/ssh-agent@v0.10.0
         with:
           ssh-private-key: ${{ secrets.BOT_SSH_PRIVATE_KEY }}
+      - uses: actions/checkout@v6
       - name: Use Node.js ${{ matrix.node-version }}
         uses: actions/setup-node@v6
         with:
           node-version: ${{ matrix.node-version }}
-      - uses: actions/checkout@v6
+          cache: 'yarn'
+          cache-dependency-path: 'yarn.lock'
       - uses: maxim-lobanov/setup-xcode@v1
         with:
           xcode-version: '26.2' # Update as needed
@@ -64,11 +66,13 @@ jobs:
       matrix:
         node-version: [24.x]
     steps:
+      - uses: actions/checkout@v6
       - name: Use Node.js ${{ matrix.node-version }}
         uses: actions/setup-node@v6
         with:
           node-version: ${{ matrix.node-version }}
-      - uses: actions/checkout@v6
+          cache: 'yarn'
+          cache-dependency-path: 'yarn.lock'
       - name: Install Linux build tools
         run: sudo apt-get update && sudo apt-get install -y build-essential
       - uses: actions/setup-java@v5