Remove main.yml and unnecessary steps from gatsby.yml

.github/workflows/gatsby.yml

@@ -1,7 +1,3 @@
-# Sample workflow for building and deploying a Gatsby site to GitHub Pages
-#
-# To get started with Gatsby see: https://www.gatsbyjs.com/docs/quick-start/
-#
 name: Deploy Gatsby site to Pages
 
 on:
@@ -36,26 +32,11 @@ jobs:
     steps:
       - name: Checkout
         uses: actions/checkout@v4
-      - name: Detect package manager
-        id: detect-package-manager
-        run: |
-          if [ -f "${{ github.workspace }}/yarn.lock" ]; then
-            echo "manager=yarn" >> $GITHUB_OUTPUT
-            echo "command=install" >> $GITHUB_OUTPUT
-            exit 0
-          elif [ -f "${{ github.workspace }}/package.json" ]; then
-            echo "manager=npm" >> $GITHUB_OUTPUT
-            echo "command=ci" >> $GITHUB_OUTPUT
-            exit 0
-          else
-            echo "Unable to determine package manager"
-            exit 1
-          fi
       - name: Setup Node
         uses: actions/setup-node@v4
         with:
           node-version: "20"
-          cache: ${{ steps.detect-package-manager.outputs.manager }}
+          cache: npm
       - name: Setup Pages
         id: pages
         uses: actions/configure-pages@v5
@@ -74,11 +55,11 @@ jobs:
           restore-keys: |
             ${{ runner.os }}-gatsby-build-
       - name: Install dependencies
-        run: ${{ steps.detect-package-manager.outputs.manager }} ${{ steps.detect-package-manager.outputs.command }}
+        run: npm ci
       - name: Build with Gatsby
         env:
           PREFIX_PATHS: 'true'
-        run: ${{ steps.detect-package-manager.outputs.manager }} run build
+        run: npm run build
       - name: Upload artifact
         uses: actions/upload-pages-artifact@v3
         with: