Added docker compose override file for debugging (#634)

docker-compose.debug.yml

@@ -0,0 +1,20 @@
+version: '2'
+services:
+    sharelatex:
+        ports:
+            - 40000:40000
+            - 30150:30150
+            - 30120:30120
+            - 30050:30050
+            - 30420:30420
+            - 30030:30030
+            - 30160:30160
+            - 30360:30360
+            - 30130:30130
+            - 30100:30100
+
+            # Server Pro
+            - 30070:30070
+            - 30400:30400
+        environment:
+            DEBUG_NODE: 'true'