fix(glibc): Ensuring nrdiag uses pure Go

[daffinito]

Issue

#248

When running the build script locally and testing, I do not receive any errors on any linux distros and the binary is statically linked

$ ldd nrdiag_x64
	not a dynamic executable

However the binaries that are being built by our release pipeline result in the following errors on Rocky Linux 8:

./nrdiag: /lib64/libc.so.6: version `GLIBC_2.34' not found (required by ./nrdiag)
./nrdiag: /lib64/libc.so.6: version `GLIBC_2.32' not found (required by ./nrdiag)

which is caused by them being dynamically linked:

$ ldd nrdiag
./nrdiag: /lib64/libc.so.6: version `GLIBC_2.34' not found (required by ./nrdiag)
./nrdiag: /lib64/libc.so.6: version `GLIBC_2.32' not found (required by ./nrdiag)
	linux-vdso.so.1 (0x00007ffd281ec000)
	libc.so.6 => /lib64/libc.so.6 (0x00007f6869ace000)
	/lib64/ld-linux-x86-64.so.2 (0x00007f6869ea4000)

Implementation Details

• Moved the CGO_ENABLED=0 setting to the go build calls directly
• Added netgo tag to ensure pure go is used for net library
• Added check to lint.yml to fail PR if any package that uses cgo is used

How to Test

I was unable to reproduce the issue when building locally, even using tools like act to try and reproduce the github actions.

[nr-linbaker]

LGTM, TY!