Docker improvements (#3042)

* Simplified dockerfile

- Changed from alpine to python:slim
- Removed some database libs (because we *connect* to a db, not host it)

* - Add gettext as required package
- Only create inventree user as part of production build (leave admin access for dev build)

* Tweaks for tasks.py

* Fix user permissions (drop to inventree user)

* Drop to the 'inventree' user level as part of init.sh

- As we have mounted volumes at 'run time' we need to ensure that the inventree user has correct permissions!
- Ref: https://stackoverflow.com/questions/39397548/how-to-give-non-root-user-in-docker-container-access-to-a-volume-mounted-on-the

* Adjust user setup

- Only drop to non-root user as part of "production" build
- Mounted external volumes make it tricky when in the dev build
- Might want to revisit this later on

* More dockerfile changes

- reduce required system packages
-

* Add new docker github workflow

* Print some more debug

* GITHUB_BASE_REF

* Add gnupg to base requirements

* Improve debug output during testing

* Refactoring updates for label printing API

- Update weasyprint version to 55.0
- Generate labels as pdf files
- Provide filename to label printing plugin
- Additional unit testing
- Improve extraction of some hidden debug data during TESTING
- Fix a spelling mistake (notifaction -> notification)

* Working on github action

* More testing

* Add requirement for pdf2image

* Fix label printing plugin and update unit testing

* Add required packages for CI

* Move docker files to the top level directory

- This allows us to build the production image directly from soure
- Don't need to re-download the source code from github
- Note: The docker install guide will need to be updated!

* Fix for docker ci file

* Print GIT SHA

* Bake git information into the production image

* Add some exta docstrings to dockerfile

* Simplify version check script

* Extract git commit info

* Extract docker tag from check_version.py

* Newline

* More work on the docker workflow

* Dockerfile fixes

- Directory / path issues

* Dockerfile fixes

- Directory / path issues

* Ignore certain steps on a pull request

* Add poppler-utils to CI

* Consolidate version check into existing CI file

* Don't run docker workflow on pull request

* Pass docker image tag through to the build

Also check .j2k files

* Add supervisord.conf example file back in

* Remove --no-cache-dir option from pip install

.gitignore

@@ -8,6 +8,7 @@ __pycache__/
 env/
 inventree-env/
 ./build/
+.cache/
 develop-eggs/
 dist/
 bin/
@@ -26,7 +27,6 @@ var/
 .installed.cfg
 *.egg
 
-
 # Django stuff:
 *.log
 local_settings.py
@@ -38,6 +38,8 @@ local_settings.py
 # Files used for testing
 dummy_image.*
 _tmp.csv
+inventree/label.pdf
+inventree/label.png
 
 # Sphinx files
 docs/_build
@@ -63,6 +65,7 @@ secret_key.txt
 .idea/
 *.code-workspace
 .vscode/
+.bash_history
 
 # Coverage reports
 .coverage