Add webhook bash script

[jason-fox]

Proposed changes

As discussed within the TSC, FIWARE Foundation need to be able to create clones of the container image on both Docker Hub and quay.io - this PR allows us to continue to track your latest container images, a functionality which has been removed from the free tier on Docker Hub

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[c0c0n3]

great, thank you @jason-fox note: the script is run manually from the FIWARE side, so the build failures are totally unrelated to this PR.