ci(workspaces): fix actions/setup-node to use correct versions of node and yarn

Author: Reversean

.github/workflows/main.yml

@@ -8,7 +8,7 @@ jobs:
       CI_JOB_NUMBER: 1
     steps:
       - uses: actions/checkout@v1
-      - name: Use Node.js from .nvmrc
+      - name: Use Node.js 20.x
         uses: actions/setup-node@v6
         with:
           node-version-file: '.nvmrc'
@@ -22,12 +22,10 @@ jobs:
       CI_JOB_NUMBER: 2
     steps:
       - uses: actions/checkout@v1
-        with:
-          fetch-depth: 0
-      - name: Use Node.js from .nvmrc
+      - name: Use Node.js 20.x
         uses: actions/setup-node@v6
         with:
           node-version-file: '.nvmrc'
       - run: corepack enable
       - run: yarn install
-      - run: yarn build:modified origin/${{ github.event.pull_request.base.ref }}
+      - run: yarn build