Fix task deploy-local

[dgageot]

Sometimes, docker agent wouldn't work after running task deploy-local and the docker-agent plugin looked corrupted

[docker-agent]

Review Summary

Assessment: 🟢 APPROVE

This change improves the deploy-local task by replacing a file copy with a symlink. The modification ensures that ~/.docker/cli-plugins/docker-agent always points to the latest build in the project directory, preventing the corruption issues mentioned in the PR description.

Key improvements:

• Uses symlink (ln -sf) instead of copy (cp -P) to link the CLI plugin
• Ensures changes are immediately reflected without re-running deploy-local
• Properly uses Task variables ({{.TASKFILE_DIR}} and {{.HOME}})
• Forces symlink creation with -sf flags to handle existing files

✅ No bugs or issues detected in the changed code.