Changes

In the release pipeline of the Silverpeas platform, enabled the build of
the docker image of Silverpeas for trial purpose.
 (commit: a21b86f)

In the silverpeas release pipeline, relax the constrain on the QA to allow the release of 6.3.5
 (commit: 3f3b79a)

Once 6.3.5 release, restore the constrains on the QA
 (commit: 34428cd)

Take into account of a first build in the pipeline of automatic build of Silverpeas
 (commit: 81fa583)

About Silverpeas Web Browser Edition:
- the build pipeline is simplified by asking to the user the branch on
  which the project has to be built (default valued at 'main')
- the release pipeline is improved to create a stable branch in the case
  the release is done from the main branch.
 (commit: e8468bf)

Update for Silverpeas 6.4.2
 (commit: 358cbd0)