chore: fix build script to always run from repo root

[mdqst]

switched the shebang to bash, added SCRIPT_DIR + REPO_ROOT, and updated docker build to always use the repo root.
now the script works no matter where you run it from.

[atanmarko]

Hello @mdqst, thank you for your PR. Unfortunately, we do not have yet the approval from our legal team to accept external contributions.

[mdqst]

Hi atanmarko

ty for the update. I completely understand the need to wait for legal approval before accepting external contributions.

wanted to briefly highlight that this PR improves the script so it now works reliably no matter where it is run from. specifically, it:

• switches the shebang to bash,
• adds SCRIPT_DIR + REPO_ROOT,
• updates the Docker build to always use the repo root.

this ensures a more robust and consistent workflow for anyone using the script. please let me know if there’s any additional information or clarification I can provide to help the legal team evaluate it, I’m happy to assist in any way.

ty for your time and consideration.

[iljakuklic]

I'm wondering if something like the following would be enough:

SCRIPT_DIR="$(dirname "$0")"

It might treat symlinks a bit differently but is it an issue?

Also, the echo message saying the script should run from the root will be outdated with this change.