Create github action to regenerate documentation with a coraza commit

[jcchavezs]

Currently the documentation upgrade process is:

go get -u github.com/corazawaf/coraza/v3@<coraza-commit-or-tag>
go mod tidy
go run mage.go generate
git add -u
git commit -m <message>

and create a PR.

We should have a github action to do that so we can trigger it on demand using this