chore: monthly updates for July'23

- migrate to `pdm` from `poetry`
- update dependencies
- improvises `dockerfile` (drops `containerfile`)
- only `python` & `pip` are required in ci/cd
- adds `compose.yml`
- simplifies local & containerized development

.gitignore

@@ -101,6 +101,9 @@ ipython_config.py
 #   https://python-poetry.org/docs/basic-usage/#commit-your-poetrylock-file-to-version-control
 #poetry.lock
 
+# pdm
+.pdm-python
+
 # PEP 582; used by e.g. github.com/David-OConnor/pyflow
 __pypackages__/