Merge pull request imgbot#624 from dabutvin/threshold

configuration option for compression threshold (fixes imgbot#562)

update path to libgit binary

Merge pull request imgbot#507 from dabutvin/update-docs-with-wiki-sup…

…port

Updated docs regarding wiki compression

mention the new external settings in the configuration doc

downgrade to ubuntu-16.04

update to elgohr/Publish-Docker-Github-Action@2.6

Merge pull request imgbot#495 from ElSiipo/master

add support for mozJpeg compression

Merge pull request imgbot#489 from dabutvin/check-size

make sure fileAfter size is greater than 0 before adding

Merge pull request imgbot#482 from dabutvin/dependabot/nuget/Magick.N…

…ET-Q16-AnyCPU-7.14.4

Bump Magick.NET-Q16-AnyCPU from 7.14.1 to 7.14.4

Merge pull request imgbot#443 from dabutvin/dependabot/nuget/Magick.N…

…ET-Q16-AnyCPU-7.14.1

Bump Magick.NET-Q16-AnyCPU from 7.14.0.2 to 7.14.1