compcrdwebhook: Support development using architectures other than x64

[csotiriou]

It seems that the compcrdwebhook webhook, in https://hub.docker.com/r/tmforumodacanvas/compcrdwebhook is built for x64 architectures. This is fine in most scenarios, but it causes issues when being present in an environment where there is another architecture (like Apple Silicon, or an arm machine).

Since the arm archtiecture is becoming more common even in clouds, I believe it could be beneficial to support docker manifest lists to support multiple architectures with the same build.

[csotiriou]

I believe that the above can be solved with the above https://github.com/tmforum-oda/oda-ca/pull/98