move back from pnpm to yarn4 lol

.gitattributes

@@ -0,0 +1,2 @@
+/.yarn/releases/** binary
+/.yarn/plugins/** binary

.github/workflows/check.yml

@@ -16,8 +16,8 @@ jobs:
           token: ${{ secrets.GITHUB_TOKEN }}
           self: Mergeability
 
-  pnpm-check:
-    name: pnpm ${{ matrix.command }}
+  yarn-check:
+    name: yarn ${{ matrix.command }}
     runs-on: ubuntu-latest
     strategy:
       fail-fast: false
@@ -26,18 +26,16 @@ jobs:
     steps:
       - uses: actions/checkout@v4
 
-      - uses: pnpm/action-setup@v3
-
       - name: Set up Node.js
         uses: actions/setup-node@v4
         with:
           node-version-file: ".node-version"
-          cache: 'pnpm'
+          cache: 'yarn'
 
       - name: Install project dependencies
-        run: pnpm install
+        run: yarn install --frozen-lockfile
 
       - name: Check ${{ matrix.command }}
-        run: pnpm --silent ${{ matrix.command }}
+        run: yarn ${{ matrix.command }}
         env:
           FORCE_COLOR: 2

.gitignore

@@ -18,7 +18,13 @@
 .env.test.local
 .env.production.local
 
-pnpm-debug.log*
+.yarn/*
+!.yarn/cache
+!.yarn/patches
+!.yarn/plugins
+!.yarn/releases
+!.yarn/sdks
+!.yarn/versions
 
 .next