Use github hooks to start building rakudo as soon as there's a new commit

[AlexDaniel]

18:13:36 <Geth> ¦ rakudo: 9e6ae276a9 | (Zoffix Znet)++ | src/core/operators.pm6 18:13:36 <Geth> ¦ rakudo: Do not sink taken values in SEQUENCE … 18:16:48 <Zoffix> e: say (<a b c>, *.reverse ... *)[5] 18:16:48 <evalable6> Zoffix, rakudo-moar 057966987: OUTPUT: «(exit code 1) The iterator of this Seq is already in use/consumed by another Seq␤(you migh…» 18:16:55 <Zoffix> 🤬🤬🤬🤬🤬 … 18:18:41 <Zoffix> e: say (<a b c>, *.reverse ... *)[5] 18:18:41 <evalable6> Zoffix, rakudo-moar 9e6ae276a: OUTPUT: «(c b a)␤»