docs: Pin the image version explicitly

[HofmeisterAn]

What does this PR do?

This PR updates the docs and explicitly sets the container builder image version. FYI: @digital88 It would be great if you could take a look and let me know if I missed anything.

Why is it important?

-

Related issues

• Relates [Enhancement]: Force user provided image name/tag when creating Builder #1540

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[digital88]

The .md files are all covered I think, but there are some files in examples folder, are you going to make a separate PR for updating Builders and pinning images in examples?

[HofmeisterAn]

are you going to make a separate PR for updating Builders and pinning images in examples?

Yes, this will be a separate PR. We need a release first, the examples require a NuGet package (they do not use a project reference).