replace Makefile with docker-compose.yml

Makefile

@@ -1,4 +0,0 @@
-DOCKER_IMAGE_NAME := fphammerle/ssh-remote-forwarding
-
-docker-build :
-	docker build -t $(DOCKER_IMAGE_NAME) .

docker-compose.yml

@@ -0,0 +1,13 @@
+# ansible's docker_service module does not support compose version 3 yet
+# https://docs.ansible.com/ansible/latest/modules/docker_service_module.html
+version: '2'
+
+services:
+  ssh_remote_forwarding:
+    build: .
+    image: fphammerle/ssh-remote-forwarding
+    environment:
+      BIND_ADDRESS: host-alias
+    restart: on-failure
+
+# https://docs.docker.com/compose/compose-file/compose-file-v2/