Allow serving app from non-root path in dev env

Usage:

$ EXTRA_SOURCES_ANSIBLE_OPTS='-e ingress_path=/awx' make docker-compose
$ curl http://localhost:8013/awx/api/v2/ping/

tools/docker-compose/ansible/roles/sources/defaults/main.yml

@@ -9,6 +9,7 @@ control_plane_node_count: 1
 minikube_container_group: false
 receptor_socket_file: /var/run/awx-receptor/receptor.sock
 receptor_image: quay.io/ansible/receptor:devel
+ingress_path: /
 
 # Keys for signing work
 receptor_rsa_bits: 4096