build: speed up rust image builds and validate env

.github/workflows/deploy.yml

@@ -138,6 +138,29 @@ jobs:
             "
           fi
 
+      - name: Validate required environment variables
+        run: |
+          ssh "${{ secrets.DEPLOY_USER }}@${{ secrets.DEPLOY_HOST }}" "
+            set -e
+            cd '${{ secrets.DEPLOY_PATH }}'
+            required_vars='
+              CRANK_DATABASE_URL
+              CRANK_MASTER_KEY
+              CRANK_SESSION_SECRET
+              CRANK_PASSWORD_PEPPER
+              CRANK_BOOTSTRAP_ADMIN_EMAIL
+              CRANK_BOOTSTRAP_ADMIN_PASSWORD
+              CRANK_PUBLIC_BASE_URL
+            '
+            for var in \$required_vars; do
+              value=\$(grep -E \"^\${var}=\" .env | tail -n1 | cut -d= -f2- || true)
+              if [ -z \"\$value\" ]; then
+                echo \"missing required env: \$var\" >&2
+                exit 1
+              fi
+            done
+          "
+
       - name: Deploy with Docker Compose
         run: |
           ssh "${{ secrets.DEPLOY_USER }}@${{ secrets.DEPLOY_HOST }}" "