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

InvenTree/plugin/base/label/label.py

@@ -1,7 +1,14 @@
 """Functions to print a label to a mixin printer"""
 import logging
+import sys
+import traceback
 
+from django.conf import settings
 from django.utils.translation import gettext_lazy as _
+from django.views.debug import ExceptionReporter
+
+import pdf2image
+from error_report.models import Error
 
 import common.notifications
 from plugin.registry import registry
@@ -9,7 +16,7 @@ from plugin.registry import registry
 logger = logging.getLogger('inventree')
 
 
-def print_label(plugin_slug, label_image, label_instance=None, user=None):
+def print_label(plugin_slug, pdf_data, filename=None, label_instance=None, user=None):
     """
     Print label with the provided plugin.
 
@@ -19,10 +26,11 @@ def print_label(plugin_slug, label_image, label_instance=None, user=None):
 
     Arguments:
         plugin_slug: The unique slug (key) of the plugin
-        label_image: A PIL.Image image object to be printed
+        pdf_data: Binary PDF data
+        filename: The intended name of the printed label
     """
 
-    logger.info(f"Plugin '{plugin_slug}' is printing a label")
+    logger.info(f"Plugin '{plugin_slug}' is printing a label '{filename}'")
 
     plugin = registry.plugins.get(plugin_slug, None)
 
@@ -30,8 +38,22 @@ def print_label(plugin_slug, label_image, label_instance=None, user=None):
         logger.error(f"Could not find matching plugin for '{plugin_slug}'")
         return
 
+    # In addition to providing a .pdf image, we'll also provide a .png file
+    png_file = pdf2image.convert_from_bytes(
+        pdf_data,
+        dpi=300,
+    )[0]
+
     try:
-        plugin.print_label(label_image, width=label_instance.width, height=label_instance.height)
+        plugin.print_label(
+            pdf_data=pdf_data,
+            png_file=png_file,
+            filename=filename,
+            label_instance=label_instance,
+            width=label_instance.width,
+            height=label_instance.height,
+            user=user
+        )
     except Exception as e:  # pragma: no cover
         # Plugin threw an error - notify the user who attempted to print
 
@@ -40,13 +62,28 @@ def print_label(plugin_slug, label_image, label_instance=None, user=None):
             'message': str(e),
         }
 
-        logger.error(f"Label printing failed: Sending notification to user '{user}'")
+        # Log an error message to the database
+        kind, info, data = sys.exc_info()
+
+        Error.objects.create(
+            kind=kind.__name__,
+            info=info,
+            data='\n'.join(traceback.format_exception(kind, info, data)),
+            path='print_label',
+            html=ExceptionReporter(None, kind, info, data).get_traceback_html(),
+        )
+
+        logger.error(f"Label printing failed: Sending notification to user '{user}'")  # pragma: no cover
 
         # Throw an error against the plugin instance
-        common.notifications.trigger_notifaction(
+        common.notifications.trigger_notification(
             plugin.plugin_config(),
             'label.printing_failed',
             targets=[user],
             context=ctx,
-            delivery_methods=[common.notifications.UIMessageNotification]
+            delivery_methods=set([common.notifications.UIMessageNotification])
         )
+
+        if settings.TESTING:
+            # If we are in testing mode, we want to know about this exception
+            raise e