CI: only deploy build artifacts on the Linux node

Author: ctrueden

.github/build.sh

@@ -1,3 +1,4 @@
 #!/bin/sh
 curl -fsLO https://raw.githubusercontent.com/scijava/scijava-scripts/master/ci-build.sh
-sh ci-build.sh
+# NB: Only the Linux CI node should deploy build artifacts.
+NO_DEPLOY=$(test "$(uname)" = Linux || echo 1) sh ci-build.sh