Fixing node and yarn issues for Github Pages.

.github/workflows/github-action-pages.yml

@@ -24,6 +24,15 @@ jobs:
         runs-on: ubuntu-latest
         steps:
             - uses: actions/checkout@v4
+            - uses: actions/setup-node@v4
+              with:
+                  node-version: 20
+            - run: corepack enable
+            - uses: actions/setup-node@v4
+              with:
+                  node-version: 20
+                  cache: yarn
+            - run: yarn install --immutable
             - name: Install packages
               run: yarn install
             - name: Build javascript