CI: tweak build script to satisfy Windows node

Author: ctrueden

.github/build.sh

@@ -1,4 +1,10 @@
-#!/bin/sh
+#!/bin/bash
+echo "Downloading ci-build script..."
 curl -fsLO https://raw.githubusercontent.com/scijava/scijava-scripts/master/ci-build.sh
+chmod +x ci-build.sh
+
 # NB: Only the Linux CI node should deploy build artifacts.
-NO_DEPLOY=$(test "$(uname)" = Linux || echo 1) sh ci-build.sh
+export NO_DEPLOY=$(test "$(uname)" = Linux || echo 1)
+
+echo "Running ci-build script..."
+./ci-build.sh