Pre-build JRuby gem

[stdedos]

Use Github-Actions to build gems for all conceivable versions.

Fixes https://github.com/ConradIrwin/interception/issues/22

Signed-off-by: Stavros Ntentos [email protected]

[stdedos]

@ConradIrwin here you go.

But ofc maybe wait first for https://github.com/ConradIrwin/interception/pull/24 to go in (i.e. fixed tests and maybe no need for "native Java extension")

[stdedos]

Also @headius