Drops privileges to user 101 and group 0 ...

When the container is started as root the default was to drop privileges to "unit:unit". This caused some problems with temporary files. Now the privileges are drop to "101:0".
When the container is started as a normal user unit prints a warning that changing the user and group is not possible. This warning is safe to ignore.

Optimise migrations on startup ...

The migrations are only started if there are some that have not been
applied. Additionally the maintenace task needed after an update are
now run after the migrations

Fix quoting of exec argument in the entrypoint script

Don't load main config twice ...

Before, the main_config (e.g. 'configuration.py' or 'ldap_config.py') were loaded twice.
The first load was hard-coded and correct.
The second load was during the discovery phase for dynamic configurations.
This has now been fixed. During the discovery for dynamic configurations,
the main_config file is now excluded.

Thanks @tobiasge for discovering this bug.

Format shell scripts with shfmt

Fix shellcheck complaint

Use black as formatter for python files

Add editorconfig

NetBox should always be referred to as NetBox ...

Fix all instances of "Netbox".

```Shell
git ls-files -z . | xargs --null -I '{}' find './{}' -type f -print0 | xargs --null sed --in-place --regexp-extended 's#Netbox#NetBox#g;'
```

Ref: https://netbox.readthedocs.io/en/stable/development/style-guide/#branding

Is greater than or equal to is "-ge" and not "-gte".

Gunicorn is replaced with nginx-unit ...

We now serve Netbox with an nginx-unit instance instead of Gunicorn.
This allows us to get rid of the extra Nginx container because Unit is
also serving the static files. The static files are now collected at container
buildtime instead of every startup.

Merge pull request #354 from comphilip/release ...

Fix ldap configuration in /etc/netbox/config/ldap/*.py not loaded

use extend method for simplification. ...

Co-authored-by: Christian Mäder <[email protected]>

Fix ldap configuration in /etc/netbox/config/ldap/*.py not loaded

Revert changes to 'gunicorn_config.py'

Adds Prometheus/Grafana monitoring infrastructure

Merge core functionality into `configuration.py` ...

Which is the file `docker/configuration.docker.py` in our repo.
The common code is then imported by `docker/ldap_config.docker.py`.

Revert accidential change to _read_secret order

Consistency in namespace name

Dot character has special meaning in module names ...

Therefore we esacpe it using the underscore character.

Lower gunicorn default loglevel

Dynamically load configuration files

Prefer secret to env variable if both are configured

Remove the 'X-Forwarded-Proto' line from the nginx config ...

The reason is that in the default configuration nginx is only serving 'http' traffic.
So if an upstream proxy sets the 'X-Forwarded-Proto' header, because it is terminating
TLS, then nginx will overwrite it to 'http'. This will cause django to think the page
is served via 'http' and it will not create 'https://...' URLs.

Related to #292

Building the Docker image with Github Actions

Merge pull request #186 from netbox-community/non-root ...

Non root

Massive speedup in executing startup_scripts

set umask in entrypoint

fix typo

Introduce $SKIP_SUPERUSER ...

This adds a new variable to skip the creation of the superuser.
That is useful for LDAP and for production environments.

Fixes #160