apt-get update on github (#113)
apt-get update on github (#113)

Summary:
Pull Request resolved: https://github.com/facebookexperimental/eden/pull/113

GitHub Actions was failing at apt-get stage,  error message suggested adding an apt-get update as remedy.  Added in this diff and it indeed works.

The actions build fails later on missing mio::net module when building mysql async, but that's unrelated to this change.

Reviewed By: farnz

Differential Revision: D34368662

fbshipit-source-id: f0a00da3ee740ae4443a328616e792ea615c922c

facebookincubator/mvfst,facebookincubator/mvfst,facebookincubator/mvfst,facebookincubator/mvfst,facebookincubator/mvfst