feat(scripts): add script for creating DB snapshots

[haikoschol]

Changes

This PR adds a Go program in ./scripts/create_snapshot for creating DB snapshots from a Gossamer node running in Docker.

Issues

#4435

[EclesioMeloJunior]

nice script! With regarding the Copy routine, given that we might face many GB of data we can try this command ( cd <source> ; tar cf - <dir to transfer> ) | ( cd <target> ; tar xvfB - ) (copy but pipe through tar) for a faster copy. Also we can provide the snapshot compressed as well

[haikoschol]

nice script! With regarding the Copy routine, given that we might face many GB of data we can try this command ( cd <source> ; tar cf - <dir to transfer> ) | ( cd <target> ; tar xvfB - ) (copy but pipe through tar) for a faster copy. Also we can provide the snapshot compressed as well

I wanted to avoid managing subprocesses. I haven't tried it, but I assume the database files won't compress well. But I can give it a go.