TF-2953 Set up test environment for Patrol tests

Made sure only 1 test using ngrok is running at a time

backend-docker/docker-compose.yaml

@@ -0,0 +1,21 @@
+version: "3"
+
+services:
+  tmail-backend:
+    image: linagora/tmail-backend:memory-branch-master
+    container_name: tmail-backend
+    volumes:
+      - ./jwt_publickey:/root/conf/jwt_publickey
+      - ./jwt_privatekey:/root/conf/jwt_privatekey
+      - ./mailetcontainer.xml:/root/conf/mailetcontainer.xml
+      - ./imapserver.xml:/root/conf/imapserver.xml
+      - ./jmap.properties:/root/conf/jmap.properties
+    ports:
+      - "80:80"
+    environment:
+      - DOMAIN=example.com
+    networks:
+      - tmail
+
+networks:
+  tmail: