Update workflow to build Docker image

.gitea/workflows/build.yml

@@ -9,19 +9,5 @@ jobs:
       - name: Checkout code
         uses: actions/checkout@v4
 
-      - name: Setup pnpm
+      - name: Build Docker image
-        uses: pnpm/action-setup@v2
+        run: docker build -t ember-market-frontend .
-        with:
-          version: 8
-
-      - name: Setup Node.js
-        uses: actions/setup-node@v4
-        with:
-          node-version: '20.9.0'
-          cache: pnpm
-
-      - name: Install dependencies
-        run: pnpm install
-
-      - name: Build
-        run: pnpm build