set: app/ as working directory

.github/workflows/nextjs.yml

@@ -3,7 +3,9 @@
 # To get started with Next.js see: https://nextjs.org/docs/getting-started
 #
 name: Deploy Next.js site to Pages
-
+defaults:
+  run:
+    working-directory: app
 on:
   # Runs on pushes targeting the default branch
   push:
@@ -34,9 +36,20 @@ jobs:
       - name: Detect package manager
         id: detect-package-manager
         run: |
-          echo "manager=npm" >> $GITHUB_OUTPUT
-          echo "command=ci" >> $GITHUB_OUTPUT
-          echo "runner=npx --no-install" >> $GITHUB_OUTPUT
+          if [ -f "${{ github.workspace }}/yarn.lock" ]; then
+            echo "manager=yarn" >> $GITHUB_OUTPUT
+            echo "command=install" >> $GITHUB_OUTPUT
+            echo "runner=yarn" >> $GITHUB_OUTPUT
+            exit 0
+          elif [ -f "${{ github.workspace }}/package.json" ]; then
+            echo "manager=npm" >> $GITHUB_OUTPUT
+            echo "command=ci" >> $GITHUB_OUTPUT
+            echo "runner=npx --no-install" >> $GITHUB_OUTPUT
+            exit 0
+          else
+            echo "Unable to determine package manager"
+            exit 1
+          fi
       - name: Setup Node
         uses: actions/setup-node@v3
         with:
@@ -54,7 +67,7 @@ jobs:
         uses: actions/cache@v3
         with:
           path: |
-            app/.next/cache
+            .next/cache
           # Generate a new cache whenever packages or source files change.
           key: ${{ runner.os }}-nextjs-${{ hashFiles('**/package-lock.json', '**/yarn.lock') }}-${{ hashFiles('**.[jt]s', '**.[jt]sx') }}
           # If source files changed but packages didn't, rebuild from a prior cache.
@@ -69,7 +82,7 @@ jobs:
       - name: Upload artifact
         uses: actions/upload-pages-artifact@v2
         with:
-          path: ./app/out
+          path: ./out
 
   # Deployment job
   deploy: