Add job to update amazon 2 in cron workflow

[brycekahle]

Adds a job that uses the amazonlinux:2 container to automatically update Amazon kernels. I figured out and added support to search both architectures from a single arch machine. I basically add the cross-arch repo on container setup and then search for packages using repoquery which supports --archlist.

Also fixes btfhub run commands to only use sudo when it is present.

This also makes a couple changes to how things are structured:

• removes archive and custom-archive directories from repo
• clones btfhub directly into the workspace directory
• clones btfhub-archive directly into the archive directory. This prevents the need for rsync-ing files around.
• adds sparse checkout of btfhub-archive to improve clone speeds.

[geyslan]

@brycekahle sorry for the delay. Is this still relevant? Should I go on reviewing it?

[brycekahle]

@geyslan We are maintaining our own fork now, since we needed to add support for kernel modules. Feel free to do what you wish with this PR.

[geyslan]

@brycekahle I'm addressing a few other issues, but I'll take a closer look at this PR soon. In the meantime, can you explain why you created a new job just for Amazon?

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I figured out and added support to search both architectures from a single arch machine. I basically add the cross-arch repo on container setup and then search for packages using repoquery which supports --archlist.

I meant, wouldn't it be possible to infer this by accessing the repo files directly?

[brycekahle]

I was unable to access the repos directly outside of Amazon Linux.

[geyslan]

@brycekahle I've got a time to go over this. I'm closing it in favour of #118.