chore(workflow): simplify database configuration

- Pass DATABASE_URL to the generation step via the step environment
  instead of writing a temporary .env file; the script reads process.env
  directly and dotenv is a no-op when no .env is present

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

Author: mouseless0x

.github/workflows/update-docs-data.yaml

@@ -51,11 +51,6 @@ jobs:
         working-directory: docs-data-updater
         run: pnpm build
 
-      - name: Create .env file with database credentials
-        working-directory: docs-data-updater
-        run: |
-          echo "DATABASE_URL=${{ secrets.DATABASE_URL }}" > .env
-
       - name: Install ORAS CLI
         run: |
           curl -LO "https://github.com/oras-project/oras/releases/download/v1.1.0/oras_1.1.0_linux_amd64.tar.gz"
@@ -74,6 +69,8 @@ jobs:
 
       - name: Generate docs data
         working-directory: docs-data-updater
+        env:
+          DATABASE_URL: ${{ secrets.DATABASE_URL }}
         run: |
           # The script logs verbose per-chain progress; keep the run output quiet
           pnpm start > /dev/null 2>&1