fix: use realpath instead of python

[evadnoob]

use realpath, always available, instead of python

realpath in python

time python -c "import os,sys; print(os.path.realpath(sys.argv[1]))" service.yaml
/Users/davidboon/Projects/outreach/devbase/evadnoob_fix_get-absolute-path-remove-python-dependency/service.yaml
python -c "import os,sys; print(os.path.realpath(sys.argv[1]))" service.yaml  0.01s user 0.02s system 7% cpu 0.436 total

realpath from coreutils

time realpath service.yaml
/Users/davidboon/Projects/outreach/devbase/evadnoob_fix_get-absolute-path-remove-python-dependency/service.yaml
realpath service.yaml  0.00s user 0.00s system 15% cpu 0.013 total

the exec to python to noticibly slower than using realpath from
coreutils

[malept]

For context:

Per Stack Exchange, realpath wasn't distributed with macOS until version 13, which probably wasn't supported by devbase when this implementation was written.

At a high level, this seems fine. However, a few things need to be resolved before this can be merged.

• Linting failed in CI.
• There's no reason for get_absolute_path to exist anymore, the one callsite can just call realpath directly.
• This only changes scripts/devbase.sh, but this file is managed by Stencil (this module, in fact). So the changes need to also happen in templates/scripts/devbase.sh.tpl as well.