Merge pull request #3 from wuvt/update_rds

Add RDS update functionality

Add .github/workflows/build.yml

Enable tag_names for Docker builds

Merge pull request #2 from wuvt/go-rewrite

Rewrite in Go

Rewrite in Go

Catch healthcheck webhook exceptions

If the healthcheck webhook fails, we don't need to bail out; instead we
should just print a warning.

Add healthchecks.io support