Simplify component build script

[phavekes]

This issue is imported from pivotal - Originaly created at Jan 23, 2020 by bstrooband

Currently when we release a component we have to confine ourselves to a build script in Stepup-build. This isn't very helpful and will get very messy over time. I think it would very helpful to create a bash script per project to build production artifacts or to use the composer archive command.

This way we would be able to easily test artifacts ourselves and we don't have to confine ourselves to a build script over time.

The only problem we need to solve or at least get consensus about is how to handle the different php versions. That would then be the only challenge in the Stepup-build build script.