feat(backup): add script for backing up jenkins_home

data/jenkins/Dockerfile

@@ -1,4 +1,4 @@
-FROM jenkins/jenkins:2.541.3-jdk17
+FROM jenkins/jenkins:2.541.3-jdk21
 
 USER root
 RUN apt-get update && apt-get install -y curl git && rm -rf /var/lib/apt/lists/*

docker-compose.yml

@@ -27,7 +27,7 @@ services:
     expose:
       - "8080"
     volumes:
-      - jenkins_home:/var/jenkins_home
+      - ./data/jenkins_home:/var/jenkins_home
       - ./data/jenkins/jenkins.yaml:/usr/share/jenkins/ref/jenkins.yaml:ro
       - ./data/jenkins/deploy:/opt/deploy:ro
       - ./data/jenkins/pipelines/Jenkinsfile.ralph:/opt/jenkins/Jenkinsfile.ralph:ro
@@ -62,6 +62,3 @@ services:
 networks:
   proxy:
     driver: bridge
-
-volumes:
-  jenkins_home:

scripts/backup-jenkins-home.sh

@@ -0,0 +1,13 @@
+#!/bin/bash
+set -euo pipefail
+
+SRC_DIR=/opt/server/data
+BACKUP_DIR=/opt/server/backups/jenkins_home
+KEEP=4
+
+mkdir -p "$BACKUP_DIR"
+
+STAMP=$(date +%Y%m%d)
+tar czf "$BACKUP_DIR/jenkins_home_$STAMP.tar.gz" -C "$SRC_DIR" jenkins_home
+
+ls -1t "$BACKUP_DIR"/jenkins_home_*.tar.gz | tail -n +$((KEEP + 1)) | xargs -r rm --