reconfigure initial commit data

Use Docker Build Cloud for releases ...

With QEMU the ARM64 builds are slow and not reliable. If we use the
Docker Cloud builders we reduce the build times considerably.
As a Docker OSS organisation we get 400 build minutes per month, which
should be fine, because we already use checks if builds are really
needed. The Docker Cloud also uses a cache that should reduce build
times a little bit more.

Prepare for Ubuntu 24.04

Update Ubuntu and Nginx Unit

Update Ubuntu und Nginx Unit

Check if the new image tag exists

Simplified basse image check

Added check for commands to all scripts

Replaced curl with Skopeo for in image functions

Updated to new unit version

Using new GITHUB_OUTPUT method

Improve Help for build.sh

Using Ubuntu 22.04 because Debian has old packages ...

With Debian the Quay.io security checker found several issues in the
image. With Ubuntu we have never versions of all packages and therefore
less (or no) issues.

Build ARM64 images

Fixed comment and variable name

Updated image labels and build script

Used version number and remove explicit dependency

First version of Debian based image

Proposed fix for netbox-docker #765 -- SKIP_GIT will skip other git operations

Group the build output in GitHub Action

Add project version to Docker tag

Improved check ...

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

Check if remote branch exists before checkout

Alpine update to 3.14

Format shell scripts with shfmt

Fix shellcheck complaint

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

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.

Upgrade Python image to 3.9-alpine ...

Upgrade the default base image to Python 3.9 and start testing on Python 3.10-rc

Fix warning in Github Actions ...

Our build script is using "set-env" which has been deprecated by Github.
See this bolg entry:
https://github.blog/changelog/2020-10-01-github-actions-deprecating-set-env-and-add-path-commands/