Should use /opt/app-root/bin or /opt/app-root/src/bin.

[GrahamDumpleton]

The directories /opt/app-root/bin and /opt/app-root/src/bin are already in PATH. Any programs you want should be installed into those. For third party applications which you are installing as part of image build, eg., tekton pipeline cli, the preferred place is /opt/app-root/bin. The directory /opt/app-root/src/bin is better for things installing as steps in the workshop.

IOW, don't use $HOME/.bin and stick in in PATH manually by editing .bash_profile.