Need to reduce K3s shipped binary size

[brandond]

Is your feature request related to a problem? Please describe.
We're creeping up on 60MB K3s binaries again, and we're going to be adding more code soon for S3 backups/restore and etcdctl.

Describe the solution you'd like
Should take steps to reduce image size. If we can't eliminate anything we should try to compress things more efficiently.

Describe alternatives you've considered
Let the binaries keep growing

Additional context
From a recent PR build: k3s binary dist/artifacts/k3s size 58429440 is less than max acceptable size of 61000000 bytes

[ShylajaDevadiga]

Validated using commit k3s version v1.20.2+k3s-5749f66a

Before compression 55M

$ k3s -v
k3s version v1.20.2+k3s1 (1d4adb03)
go version go1.15.5

$ ls -lh /usr/local/bin/k3s
-rwxr-xr-x 1 root root 55M Feb 17 00:32 /usr/local/bin/k3s

After compression 44M

$ k3s -v
k3s version v1.20.2+k3s-5749f66a (5749f66a)
go version go1.15.8

$ ls -lh /usr/local/bin/k3s
-rwxr-xr-x 1 root root 44M Feb 16 23:54 /usr/local/bin/k3s