Fix frontend Docker build OOM: limit Node heap + request more memory

- Set NODE_OPTIONS=--max-old-space-size=512 in Dockerfile to cap tsc
  heap usage within constrained CI pods
- Add resource requests (1Gi) and limits (2Gi) to frontend Docker
  build steps in Drone pipeline

.drone.yml

@@ -23,6 +23,11 @@ steps:
 
   - name: Cache builder stage
     image: plugins/docker
+    resources:
+      requests:
+        memory: 1Gi
+      limits:
+        memory: 2Gi
     settings:
       username: viktorbarzin
       password:
@@ -38,6 +43,11 @@ steps:
 
   - name: Build frontend image
     image: plugins/docker
+    resources:
+      requests:
+        memory: 1Gi
+      limits:
+        memory: 2Gi
     settings:
       username: viktorbarzin
       password: