chore(CI): Add a worflow to check if translationtool.phar is build

[nickvergessen]

An attempt to prevent issues with forgotten/missing recompile like #355 fixed in #362

Unluckily it seems to be dirty when I compile locally. I tried to diff the phar and there are some additional non-source files in one of the vendor dependencies (LICENSE, README.md, ...) but I cleared the vendor directories locally so actions and me use the same: composer.lock state, a clean vendor/ folder, same php version, ....

I have no clue. So I will just save this as a draft for now.