在Alpine Docker镜像中安装openssh包遇依赖冲突求助

我的Dockerfile内容如下：

FROM alpine:latest
RUN apk update
RUN apk add --no-cache curl openssh sshpass rsync
#etc

docker-compose.yml文件内容：

[...]
services:
  my-container:
    build:
      context: ./my-folder
      dockerfile: Dockerfile
    container_name: my-container
    restart: unless-stopped
    #etc

执行命令：

docker-compose up -d --remove-orphans --build

构建时出现错误：

=> ERROR [3/7] RUN apk add --no-cache curl openssh sshpass rsync                                                                                                                                               3.7s
------                                                                                                                                                                                                               
 > [3/7] RUN apk add --no-cache curl openssh sshpass rsync:                                                                                                                                                          
#0 1.448 fetch https://dl-cdn.alpinelinux.org/alpine/v3.18/main/aarch64/APKINDEX.tar.gz                                                                                                                              
#0 1.859 fetch https://dl-cdn.alpinelinux.org/alpine/v3.18/community/aarch64/APKINDEX.tar.gz                                                                                                                         
#0 2.732 ERROR: unable to select packages:                                                                                                                                                                           
#0 2.741   openssh-client-common-9.3_p1-r3:
#0 2.741     breaks: openssh-client-default-9.3_p2-r0[openssh-client-common=9.3_p2-r0]

已尝试的操作：更换多个Alpine镜像版本、执行docker builder prune清理缓存、指定openssh具体版本、仅安装openssh，错误依然存在。

补充信息：Docker运行在已完全更新的64位树莓派系统上，Docker版本信息：

$ docker version
Client: Docker Engine - Community
 Version:           24.0.4
 API version:       1.43
 Go version:        go1.20.5
 Git commit:        3713ee1
 Built:             Fri Jul  7 14:50:52 2023
 OS/Arch:           linux/arm64
 Context:           default

Server: Docker Engine - Community
 Engine:
  Version:          24.0.4
  API version:      1.43 (minimum version 1.12)
  Go version:       go1.20.5
  Git commit:       4ffc614
  Built:            Fri Jul  7 14:50:52 2023
  OS/Arch:          linux/arm64
  Experimental:     false
 containerd:
  Version:          1.6.21
  GitCommit:        3dce8eb055cbb6872793272b4f20ed16117344f8
 runc:
  Version:          1.1.7
  GitCommit:        v1.1.7-0-g860f061
 docker-init:
  Version:          0.19.0
  GitCommit:        de40ad0

• 强制刷新APK索引并清理本地缓存：在apk update后加入apk cache clean，确保拉取最新的包索引，避免旧缓存引发版本冲突。修改Dockerfile命令：

  RUN apk update && apk cache clean && apk add --no-cache curl openssh sshpass rsync
  

• 指定兼容的openssh版本组合：直接指定与openssh-client-common匹配的版本，比如安装同版本的客户端和服务端：

  RUN apk add --no-cache curl openssh-client=9.3_p1-r3 openssh-server=9.3_p1-r3 sshpass rsync
  

• 切换Alpine镜像源：部分官方源可能存在同步延迟，换成同步及时的源。在apk update前添加源替换命令：

  RUN sed -i 's/dl-cdn.alpinelinux.org/mirrors.aliyun.com/g' /etc/apk/repositories
  RUN apk update && apk add --no-cache curl openssh sshpass rsync
  

• 彻底清理Docker构建环境：除了docker builder prune，删除相关镜像和容器后重新构建：

  docker-compose down -v
  docker rmi my-container
  docker builder prune -a
  docker-compose up -d --build
  

• 改用Alpine稳定分支：latest标签可能指向刚更新的分支，存在依赖冲突，改用明确的稳定版本，比如alpine:3.17：

  FROM alpine:3.17
  RUN apk update && apk add --no-cache curl openssh sshpass rsync
  

内容的提问来源于stack exchange，提问作者Alex