Use sdk manager to accept licenses

Since inserting the license keys directly relies on factors outside of
the build environment and so will be more likely to fail without a clear
reason.
4 jobs for master in 24 minutes and 23 seconds (queued for 14 seconds)
latest
Status Job ID Name Coverage
  Test
passed #214968476
test:cargo

00:01:28

 
  Cargo:Test:Nightly
passed #214968477
allowed to fail
cargo:test:nightly

00:01:55

 
  Build
passed #214968478
build

00:18:12

 
  Sign
passed #214968479
sign

00:02:47