Extension compliance updates

[javaducky]

This PR does multiple things:

• minor refactoring of examples
• upgrades to the latest version of k6 and other dependencies
• enables linting in CI workflow
• addresses any linter issues
• adds unit testing using SQLLite
• tweaks docker-run.sh helper script to allow pass-through of additional k6 arguments, e.g. --quiet

Fixes #34 and partially addresses issues defined in #5.

[imiric]

Thanks for this @javaducky! 🙇 It's great that we have at least one proper test now 😅🎉

I left some minor and not-so-minor suggestions. Mainly I think we should be careful with the SQL.Query() changes.

[imiric]

I think we should drop this Dockerfile now that xk6 has one. And update the note in the README with the right command to build xk6-sql with it.

[javaducky]

xk6 image does not yet support CGO_ENABLED as required for SQLite3 support. I created an issue in xk6 for this.

[imiric]

As I mentioned in the issue, this doesn't require any changes in the grafana/xk6 image.

So I'd still prefer removing this Dockerfile and the docker-run.sh script.

[javaducky]

We should keep this until xk6 docker image is actually able to build the binary. Once we can build using CGO_ENABLED, I'll be more than happy to update the documentation and remove the Dockerfile and docker-run.sh files.

[imiric]

Same with this script, I would remove it. The way to simplify the Docker CLI is to use Docker Compose, but for this simple extension, I don't think we need it either.

[javaducky]

Leaving this as the CGO support is required to switch to the xk6 docker image.