Add a health action to sites controller to check g5k-api availability

3 jobs for features/#13404 in 17 minutes and 48 seconds (queued for 3 seconds)
Status Job ID Name Coverage
  Lint
passed #1364709
grid5000-docker
rubocop

00:01:30

 
  Test
passed #1364710
grid5000-docker
test-for-buster

00:08:08

80.48%
 
  Deb
passed #1364711
grid5000-docker
deb-for-buster

00:08:09