feat: transfer project management to Pixi (#133)

* feat: started port to pixi

* feat: updated test suite for pixi and started refactor of cicd

* build: added coverage to gha

* fix: explicitly direct location of package code and update pixi in pipeline

* fix: added linux to pixi

* chore: update GitHub Actions workflow for improved deployment process

* chore: clean up GitHub Actions workflow by removing commented-out jobs and updating dependencies

* chore: update GitHub Actions workflow to deploy from both main and devel branches, and refresh dependencies in pixi.lock

* chore(sem-ver): 1.6.0-rc.1

* fix: update version_toml path in pyproject.toml for semantic release

* chore(sem-ver): 1.6.0-rc.2

* chore: remove requirements.txt file and poetry.lock

* chore: update authors and maintainers in pyproject.toml,  and add __version__ in __init__.py

* chore: remove setup.py file as part of project restructuring

* chore: update pixi.lock and add ruff configuration for linting

* chore: fix some recommendations from coderabbit

---------

Co-authored-by: semantic-release <semantic-release>

src/imgtools/__init__.py

@@ -1,5 +1,2 @@
-# from . import io, ops, pipeline, utils
 
-# __all__ = ['io', 'ops', 'utils', 'pipeline']
-
-__version__ = '1.6.0-rc.2'
+__version__ = "1.6.0-rc.2"