Gradle getdown release

Create the getdown release channel for Jalview.org
None

Plan branches

Plan Build Completed Tests Reason
bug-JAL-4107_jalviewjs_fixes_on_2_12_branch No build history Never built
bug-JAL-4559_old_cli_args_in_JVL_docs No build history Never built
bug-JAL-4623_JAL-4624_PCA_for_SS No build history Never built
patch-JAL-4606_again_and_again No build history Never built