publish / release plug-in

[mifot]

• [x] prepare first public release
• [x] convert project to public
• [x] consider publish plug-in in https://artifacthub.io/

[mifot]

some useful links

• https://www.digitalocean.com/community/tutorials/how-to-build-go-executables-for-multiple-platforms-on-ubuntu-20-04
• https://docs.github.com/en/repositories/releasing-projects-on-github/managing-releases-in-a-repository#creating-a-release

[mifot]

improve install script based on the following example

• https://github.com/databus23/helm-diff/blob/master/install-binary.sh