Inline NODE_OPTIONS for CI check step

Step-level env may not propagate to pnpm subprocesses in Gitea
Actions. Inline the variable directly in the command instead.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

.gitea/workflows/ci.yml

@@ -20,9 +20,7 @@ jobs:
           node-version: 22
 
       - run: pnpm install --frozen-lockfile
-      - run: pnpm check
-        env:
-          NODE_OPTIONS: "--max-old-space-size=2048"
+      - run: NODE_OPTIONS="--max-old-space-size=2048" pnpm check
 
   build-image:
     if: startsWith(github.ref, 'refs/tags/')