Enable tracing, for debugging & progress

This makes it easier to see how far along the script is when running,
essentially acting as a sort of simple progress bar.  Being able to see
which command failed when something goes wrong makes troubleshooting a
bit easier.

Author: amartini51

bin/publish-book

@@ -21,7 +21,7 @@
 #     PATH=~/git/DocC/.build/arm64-apple-macosx/debug:$PATH
 #     DOCC_HTML_DIR=~/git/DocC-Renderer/dist/
 
-set -eu
+set -eux
 
 # Pretty print DocC JSON output, so that it has a stable ordering and
 # can be diffed.  This lets us determine whether rebuilding resulted in