See https://georchestra.geo-solutions.it/ (work in progress)
Clone the repository:
git clone --recursive https://github.com/georchestra/mapstore2-georchestra.git
Install latest 8.x NodeJS, if needed, from here.( minimal versions: NodeJS >= 8, npm >= 5 )
Install Java SDK, if needed from here (version 1.8 is required)
Install latest Maven, if needed, from here (version 3.5.2 is required).
Build the deployable war:
./build.sh [version_identifier]
Where version_identifier is an optional identifier of the generated war that will be shown in the settings panel of the application.
Deploy the generated GeOrchestra.war file (in web/target) to your favourite J2EE container (e.g. Tomcat).