This commit replaces `os.Setenv` with `t.Setenv` in tests. The
environment variable is automatically restored to its original value
when the test and all its subtests complete.
Reference: https://pkg.go.dev/testing#T.Setenv
Signed-off-by: Eng Zer Jun <engzerjun@gmail.com>
Sets the `kubernetes.io/arch` (and legacy `beta.kubernetes.io/arch`)
to the proper instance architecture.
While at it, re-gen the instance types list (adding new instance types
that were missing)
Eng Zer Jun
Johannes Würbach
Austin Siu
Adrian Lai
Benjamin Pineau
Jiaxin Shan