CI: Linux CI jobs naming

Pool:

• It's description for architecture (we build for the lowest denominator).
• It doesn't have any connection to Debian, Fedora, Alpine or any environment we build in, it's description. Extra important for newbies (so please consider that, since you're all obviously familiar with our CI).
• Anything is better than what we have now (we call 64-bit machines by x86 ‒ which is usually associated with 32-bit).

x86:

1. x86-64, x86-32 // bit dupl, but clear
2. x86_64, x86_32 // same, just underscore, which we use in CI
3. amd64, x86 // beware: amd64 X arm64 is a bit unpleasant
4. amd64, i686
5. amd64, i386 // i386 is really never used, distros target i686+

ARM:

1. aarch64, arm32
2. aarch64, aarch32
3. aarch64, armv7
4. arm64, arm32
5. armv8, armv7
6. arm64, armhf

Please, Post arch and number.