End-to-end parallel run re-usable workflow on GHA

[cbeauchesne]

• better get-workflow-parameter API
• ability to save images in binaries : docker save system_tests/weblog | gzip > binaries/weblog.tar.gz Build script can save/load images in/from files in binaries folder #4153
• ability to load weblog/agent images from binaries : docker load --input binaries/weblog.tar.gz Build script can save/load images in/from files in binaries folder #4153
• Adapt build.sh to allow loading from binaries Build script can save/load images in/from files in binaries folder #4153
• ...