introduce multi-project pipelines

Motivation:

One of the marketplace web-server dependencies is the marketplace-webapp.

Hence any changes in this repository should trigger a new ci/cd in the marketplace web-server.

Modification:

• separate the test phase from the build.

• add a trigger to the deploy stage

Result:

Each new merge request and commit will create a new ci/cd build in the marketplace web-server repository.

Target: master