add grp guid to env

compose.yml

@@ -11,6 +11,7 @@ services:
     volumes:
       - /var/run/docker.sock:/var/run/docker.sock
     environment:
-        JENKINS_AGENT_SSH_PUBKEY: ${ssh_key} 
+        JENKINS_AGENT_SSH_PUBKEY: ${ssh_key}
+        DOCKER_GID: ${docker_gid} 
     networks:
       - jenkins

dockerfile

@@ -1,5 +1,9 @@
 FROM jenkins/ssh-agent:latest-debian-jdk21
 
+ARG DOCKER_GID=${DOCKER_GID:-994}
+RUN groupadd -for -g ${DOCKER_GID} docker \
+    && usermod -aG docker jenkins
+
 RUN apt-get update \
     && apt-get install -y --no-install-recommends \
         ca-certificates \