builbo: some script clean-ups

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Pull request overview

This PR updates the builbo CLI script, primarily refactoring how defaults are defined/displayed and how command-line arguments/actions are parsed and validated.

Changes:

• Introduces DEFAULT_* variables and updates usage() output to show those defaults.
• Refactors argument parsing flow and adds extensive console logging during parsing.
• Adjusts image naming/formatting and expands variable usage to ${...} form.

Comments suppressed due to low confidence (1)

cli/builbo:77

• -i/--shell is documented in usage() (and mentioned in the help text), but it is not actually parsed/handled: optstring doesn’t include i, optstring_long doesn’t include shell, and there is no case arm for it. Either implement the option (set I_SHELL) or remove it from the usage/help text so the CLI contract matches behavior.

[ -s  | --build-script (command|path) ]              - command or local script (in the CWD)  for building the project.
[ -d | --deps (pkg,pkg,pkg,...) ]            - additional packages to install (comma-separated)
  -i | --shell (bash) ]                      - sinteractive shell (default: ${DEFAULT_I_SHELL})
[ -h | --help ]                              - action help: print this usage information
[-t | --test ]                               - action test: print some diagnostic info for  testing this program
[ -b | --build ]                             - action build: perform a build in the CWD
[ -e | --enter]                              - action enter: enter container in interactive mode (shell)


The Options -l, -r, -o, and -n in combination determine the  buildbox image (by tag) to be used.


The options -h, -t, -e, and -b are the available actions (help, test, enter, and build) to be performed.

Exactly one of the actions  must be selected.

The build action requires the additional option -s.
The enter action  makes use of the --shell option.

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