add dockerfile with docker

compose.yml

@@ -4,7 +4,9 @@ networks:
 
 services:
   jenkins_docker_ssh_agent:
-    image: jenkins/ssh-agent
+    build: 
+      context: .
+      dockerfile: dockerfile
     container_name: jenkins_docker_ssh_agent
     environment:
         JENKINS_AGENT_SSH_PUBKEY: ${ssh_key}