Allow support of non-GNU distros (introduce a static binary?)

[nickavem]

Is your feature request related to a problem? Please describe.
Right now the toolbox binary is dynamically linked:

/usr/bin/toolbox: ELF 64-bit LSB pie executable, x86-64, version 1 (SYSV), dynamically linked, interpreter /lib64/ld-linux-x86-64.so.2, BuildID[sha1]=f906e6e328b8ae7640b80a674713877e7cea2af5, for GNU/Linux 3.2.0, stripped

This makes it only useable with GNU/Linux guests.

Describe the solution you'd like
Introduce a static binary. I believe this should be fully doable with the Go language.

Describe alternatives you've considered
Create a musl compatible binary
Provide a mode to also automatically install required interpreters on non-GNU guests

[anthr76]

Would be awesome to have this for mac, but then podman is lacking. Toolbox seems pretty closely integrated with Linux. Nonetheless it would be cool to see a statically built binary.

[HarryMichal]

There was an effort for having Toolbox build statically in the past. @debarshiray had some thoughts that made us decide against the decision. Maybe it's time to revisit this decision.

[debarshiray]

Since #897 we run the /usr/bin/toolbox binary against the host's run-time, even for the init-container command inside the container. That should make it possible to use it with containers that have a different run-time implementation than the host. eg., musl versus glibc.

[debarshiray]

Thanks for stopping by.