add multiple test container example

[akoserwal]

Related Issue or Design Document

Hi Team, I create a blog guide on creating multiple dependent test containers using the docker test library with code examples. Work around for issue: #511

https://akoserwal.medium.com/creating-multiple-test-containers-with-ory-dockertest-in-go-5b8311614e7b

If you think this example is good, then we can add it.

Checklist

• I have read the contributing guidelines and signed the CLA.
• I have referenced an issue containing the design document if my change introduces a new feature.
• I have read the security policy.
• I confirm that this pull request does not address a security vulnerability.
  If this pull request addresses a security vulnerability,
  I confirm that I got approval (please contact [email protected]) from the maintainers to push the changes.
• I have added tests that prove my fix is effective or that my feature works.
• I have added the necessary documentation within the code base (if appropriate).

Further comments

[CLAassistant]

All committers have signed the CLA.

[aeneasr]

Awesome, thank you! 🎉 Your contribution makes Ory better :)

[tacerus]

Hello, could the contents not be written into the Markdown file in this repository? All the other files in the examples/ directory provide examples, and this one is merely a link to a third party website - which is already not ideal as the content of it can change at an point or disappear without trace, but this one is additionally forcing one to register and log in in order to view the content.