Gradle getdown release

Create the getdown release channel for Jalview.org
None

Plan branches

Plan Build Completed Tests Reason
task-JAL-3805_Remove_Old_Jalview_Uninstaller_application No build history Never built
task-JAL-3805_Remove_Uninstall_Old_Jalview_application_for_develop_branch No build history Never built
test-JAL-2422_testing_on_linux No build history Never built