chore: replace yarn with pnpm

.github/workflows/build.yml

@@ -10,22 +10,40 @@ jobs:
 
     runs-on: ubuntu-latest
 
-    strategy:
-      matrix:
-        node-version: [14.x]
-
     steps:
     - uses: actions/checkout@v2
-    - name: Use Node.js ${{ matrix.node-version }}
-      uses: actions/setup-node@v1
+    - name: Use Node.js 18
+      uses: actions/setup-node@v3
+      with:
+        node-version: 18
+
+    - uses: pnpm/action-setup@v2
+      name: Install pnpm
+      id: pnpm-install
       with:
-        node-version: ${{ matrix.node-version }}
-    - name: Yarn CLI
-      uses: CultureHQ/[email protected]
-    - run: yarn
+        version: 9
+        run_install: false
+
+    - name: Get pnpm store directory
+      id: pnpm-cache
+      shell: bash
+      run: |
+        echo "STORE_PATH=$(pnpm store path)" >> $GITHUB_OUTPUT
+
+    - uses: actions/cache@v3
+      name: Setup pnpm cache
+      with:
+        path: ${{ steps.pnpm-cache.outputs.STORE_PATH }}
+        key: ${{ runner.os }}-pnpm-store-${{ hashFiles('**/pnpm-lock.yaml') }}
+        restore-keys: |
+          ${{ runner.os }}-pnpm-store-
+
+    - name: Install dependencies
+      shell: bash
+      run: pnpm install
 
     - name: Run linter
-      run: yarn lint
+      run: pnpm lint
 
     - name: Run next build
       env:
@@ -37,5 +55,4 @@ jobs:
         NEXT_PUBLIC_GA_TRACKING_ID: ${{ secrets.NEXT_PUBLIC_GA_TRACKING_ID }}
         HACKMD_CHANGELOG_ID: ${{ secrets.HACKMD_CHANGELOG_ID }}
 
-      run: |
-        yarn build
+      run: pnpm build

.nvmrc

@@ -1 +1 @@
-14
+18