[BUG] Container build failing - Kinetic eol

[jwahsnakupaku]

Describe the bug
Builds are failing as of recently when trying to build the backend docker container.

 => ERROR [backend stage-0  6/16] RUN --mount=type=cache,target=/var/cache/apt,sharing=locked     --mount=type=cache,target=/var/lib/apt,sharing=locked     apt-get -qq update &&     a  3.1s
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 > [backend stage-0  6/16] RUN --mount=type=cache,target=/var/cache/apt,sharing=locked     --mount=type=cache,target=/var/lib/apt,sharing=locked     apt-get -qq update &&     apt-get install -qq -y --no-install-recommends     automake     build-essential     cmake     curl     gcc     git     gpg     libglu1-mesa     libtool     make     swig     python3-dev     python3-pip     python3-wheel     python-is-python3     pkg-config:
2.634 E: The repository 'http://ports.ubuntu.com kinetic Release' does not have a Release file.
2.634 E: The repository 'http://archive.ubuntu.com/ubuntu kinetic Release' does not have a Release file.

Kinetic is EOL, must've been removed from the repos recently.
http://archive.ubuntu.com/ubuntu/dists/
http://ports.ubuntu.com/dists/

Steps to reproduce
Steps to reproduce the behavior:
Build docker image from source.

Expected behavior
Build succeeds.

Screenshots
N/A

Release
master

[phutelmyer]

Thank you @jwahsnakupaku. This seems to have been fixed in #396. After approval / tests I will merge and create a new release.