Optimize apk install process in Dockerfile

[PeterDaveHello]

Merge two apk install commands and use the --no-cache parameter to minimize the temporary files left in the Docker image.

I also noticed that there were different apk install processes in the Dockerfile. The second one has the process to replace https with http in /etc/apk/repositories before the installation, but the first one doesn't, meaning the process is unnecessary.

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[c121914yu]

Yes, the initial installation can also use no cache.

[PeterDaveHello]

Could do so for best practice. The reason why I didn't do it is because that image shouldn't affect the one that will be released 😄