$ ./run_sdk_container -t
fatal: No names found, cannot describe anything.

Reproduce

Here's the original: https://github.com/flatcar/scripts
Here's the fork: https://github.com/RiRa12621/scripts

Clone the fork: git clone https://github.com/RiRa12621/scripts.git
Move to dir: cd scripts
Set branch: branch="patch-1"
Run script:

$ ./run_sdk_container -t
fatal: No names found, cannot describe anything.

The issue is that there's a git describe --tags happening at https://github.com/flatcar/scripts/blob/main/sdk_lib/sdk_container_common.sh#L58 and that doesn't return anything.

Hypothetically, this can be mitigated via the following commands:

git remote add upstream https://github.com/flatcar/scripts.git
git fetch --tags upstream

However it's hard to find out if your on a fork without making a call got the GitHub API, hence I'm not sure if this is something that should be part of the script, or rather just the docs. Happy to contribute either of the two, once the best approach is decided.