add reusable workflows for deploying nightly binaries

[samansmink]

This PR adds the reusable workflow for extension deployment to the postgress scanner, which allows producing nightly binaries. In the process, I removed the workflows that would be duplicates, leaving only the linux job that would actually run the tests with the postgres server. Also i added a require-env to all tests because the reusable workflow will call make test

@Mytherin Before merging we need to add the s3 credentials and signing token to the repo. Maybe we can add them as an organisation secret?

[Mytherin]

Thanks for the PR! Looks great. One minor comment. For the organization secrets, perhaps @hannes can have a look?

[samansmink]

Thanks for the PR! Looks great. One minor comment. For the organization secrets, perhaps @hannes can have a look?

I'll chat with hannes today on this

[Mytherin]

Thanks for the updates - is this ready to merge?

[samansmink]

yea think so!

[Mytherin]

Thanks!