Description

This change improves how the username is detected when tagging the clp‑package development Docker image, addressing issue #1371:

1. get user from env var USER
2. if that fails (likely due to the variable being missing from the terminal environment), run whoami
3. if that still fails (likely due to the whoami binary missing), run id --user --name
4. if that still fails (likely due to the username missing from /etc/passwd), run id --user to just get the user id
5. if that still fails (likely due to the idbinary missing), use unknown as the fallback.

Checklist

• The PR satisfies the contribution guidelines.
• This is a breaking change and that has been indicated in the PR title, OR this isn't a
  breaking change.
• Necessary docs have been updated, OR no docs need to be updated.

Validation performed

1. Ran the script in a typical environment (WSL Ubuntu 22.04 + Docker Desktop), and found the image was tagged with clp-package:dev-<username>-<hash> by checking docker image ls
2. Ran the script in a docker contained environment where the USER env var is missing and the username is missing from /etc/passwd, and found the image was tagged with clp-package:dev-<username-id>-<hash> by checking docker image ls:

   docker run -it \
       -v /var/run/docker.sock:/var/run/docker.sock \
       -v /usr/bin/docker:/usr/bin/docker:ro \
       -v /usr/libexec/docker/cli-plugins:/usr/libexec/docker/cli-plugins:ro \
       -v /home/$(id -un):/home/$(id -un) \
       --user $(id -u):$(getent group docker | cut -d: -f3) \
       -e HOME=/home/$(id -u) \
       -e TERM=$TERM \
       -w /home/$(id -u) \
       ghcr.io/y-scope/clp/clp-core-dependencies-x86-ubuntu-jammy:main \
       /bin/bash --login

Summary by CodeRabbit

• Chores
  • Improved Docker build script to reliably detect the current user (with a fallback to “unknown”) and apply it to dev image tags as dev-{user}-{short_id}, enhancing consistency and traceability of locally built images.
  • No runtime behaviour or public API changes.

• To see the specific tasks where the Asana app for GitHub is being used, see below:
  • https://app.asana.com/0/0/1212888467122209
  • https://app.asana.com/0/0/1212888453758111