removes the prebuild stage from the final image
which solves the issue that build dependencies
where not cleaned up properly. Saves a couple
of MB in image size.
* fix parsing dict variables from env
The INVENTREE_SOCIAL_PROVIDERS variable has been parsed as a string from
the environment which resulted in an attribute error as dict was the
expected variable type. To circumvent this error, parsing JSON strings
as dictionary values from the environment has been added
* add unit tests for env typecasting to dict
SELinux labels are required in order to mount the volumes into the dev
containers. The build config has been added to the dev-worker to prevent
podman from trying to pull from docker hub