Add goreleaser

[yarlson]

No description provided.

[ferama]

Thanks @yarlson :)

Seems a good starting point but the release should be performed automatically from the CI tools (from here https://github.com/ferama/rospo/blob/main/.github/workflows/main.yml)

It could be useful also to merge the docker pipeline with the main pipeline. From what I see goreleaser supports build/push of docker images too (but this one could be the subject for another PR)

Anyway to be merged it should at least:

1. include test running into the release.sh script and fail if test fails
2. provide CI integration (adapting .github/workflows/main.yml)
3. the build process must correctly set the ldflags (look at the build.sh file)

about the point 3, we need to set the github.com/ferama/rospo/cmd.Version value. This is needed to make the flag

$ rospo -v
rospo version 0.6.3

to work correctly.

Thanks