* feat: builds with gox and buildx
This change builds all of Authelia respective binaries in parallel within a single step and distributes as necessary to subsequent steps, we now also build and distribute for the following OS/Architecture: freebsd/amd64.
Our CI/CD pipeline now also utilises docker buildx as a default for builds and pushes.
* refactor: clean up docker helper
* Remove `authelia-scripts docker push-image` command as all pushes will be performed with buildx and manifests
* Rename the --arch flag to --container
* Add Dockerfile.dev for users that want to build an Authelia container from source without utilising suites
* Set Dockerfile.dev as default for `authelia-scripts docker build` command
* refactor: variant -> container
* feat: build and distribute .deb packages
Creates .deb packages for distribution via GitHub releases and Buildkite builds for the following architectures:
* amd64
* armhf
* arm64
* fix: pkgver reference in debpackages.sh
* refactor: split deb packaging jobs and quote variables
* fix: pipeline upload for debpackages
* fix: depends_on key for debpackages
* fix: add depends_on: ~ for debpackages step
* fix: pre-artifact hook for debpackages
* fix: add .deb suffix in pre-artifact hook
* fix: variable reference in debhelper.sh
* refactor: silence wget output in debhelper.sh
* refactor: make build concurrency gate only depend_on docker builds
* refactor: make build concurrency gate also depend_on coverage build
* refactor: remove dependencies for build concurrency gate
