Calulate default OS_TYPE

[pellared]

Why

Better UX. No need to provide OS_TYPE

Part of #1373

What

Calculate OS_TYPE using uname -s and ldd /bin/ls

Tests

CI and locally

Checklist

• CHANGELOG.md is updated.
• Documentation is updated.
• New features are covered by tests.

[pellared]

I want to merge #1402 first

[pjanotti]

LGTM, but, as a know-very-little-bash-script person I have to ask: is it worth to put the code to select the OS type in a shareable way? Likely not worth the trouble but I have to ask 😬

[pellared]

is it worth to put the code to select the OS type in a shareable way

I have no idea how to do it (and I was considering it 😅 )

1. download.sh is the "first" script that the user downloads to setup. the instrument.sh is not available until it is extracted
2. I assume that once the user downloads (installs) then he/she only needs instrument.sh and download.sh is no longer needed (also getting the path to download.sh would be probably close to impossible)

Side note:

"A little copying is better than a little dependency. "

😸