Switch to GitHub actions

[p37ruh4]

Switch from Travis CI to GitHub actions, I will highlight some of the changes:

1. build will automatically determine if interactive shell is available, it is required for GitLab actions to work
2. YUM and DNF cache will be reused between containers to avoid it being downloaded again for each RPM package, should significantly improve performance

Travis CI is slow, not being maintained too much lately and will only get worse over time, so I suggest switching to GitHub actions. Also, it's nice to have one external dependency less.

[p37ruh4]

@lest, I will want to hear your opinion on this. One thing to note, currently publish tasks will not work, as they might require slight adjustment, I've added echo in front of them so that they do not actually run.

[karlism]

@lest, can you please look into this and #335? I'm currently affected by couple of exporter issues where update to more recent versions could potentially resolve issues, but would like these two PRs to be merge first so that we can test them out.

[p37ruh4]

@lest, are these steps actually required? I can see sign target in Makefile but it appears that it was not used in .travis.ci.

[lest]

sign is not used on its own. sign7 and sign8 are used as they are specified as dependencies for publish7 and publish8.

[p37ruh4]

@lest, is there any point in separating publish jobs and run make publish7 & make publish8 separately instead of doing that in single step that includes both of them? (make publish)

[lest]

I think we can have a single step that includes both with the new approach for caching RPMs between jobs.

[karlism]

@lest, any updates on this? Travis CI has been PITA lately with most of the jobs failing:

[lest]

@karlism everything looks alright. I've added all required secrets to the repository, so we can merge it and see it in action.

[karlism]

Thanks, will try to update some packages to see if everything works as expected.

[lest]

@karlism Looks like there are a few issues with getting it fully running. I'm testing and making required adjustments now.

[karlism]

@lest, what issues did you see? Tests in this PR were successful, I've just merged it in master to see if publish jobs will succeed: #350

[karlism]

Looks like publish packages Create GPG key secret job failed:
https://github.com/lest/prometheus-rpm/runs/2120554172

Run openssl aes-256-cbc -k ${RPM_GPG_KEY_SECRET} -in secret.asc.enc -out secret.asc -d
*** WARNING : deprecated key derivation used.
Using -iter or -pbkdf2 would be better.
bad decrypt
140037249672512:error:06065064:digital envelope routines:EVP_DecryptFinal_ex:bad decrypt:../crypto/evp/evp_enc.c:615:

[lest]

@karlism I got it fixed.

[karlism]

@lest, thanks! Why did you remove this check? 19b4f67#diff-5c3fa597431eda03ac3339ae6bf7f05e1a50d6fc7333679ec38e21b337cb6721L98
This might be an issue if someone attempts to run actions on forked repositories

[lest]

@karlism this check resulted in the step being skipped for some reason during my testing. I think we can have it applied to the whole publish_packages job instead of a single step.