Changes

In the build of the docker image silverbuild, fix the case no changes has been done in the Dockerfile before tagging the project

Update different pipeline to take into account the new Docker image silverbuild 6.4

Fix a bug in the pipeline for releasing a version of Silverpeas. The
isPatchVersion is an environment variable and as such it can be only a
String. But in the pipeline it is interpreted as it was a boolean. Fix
this by checking each time the boolean value as a String.