[try] compile themes

.ci/batch-byte-compile.sh

@@ -20,7 +20,7 @@ trap cleanup ERR INT TERM
 # Directory extensions is skipped because this is not Exordium code.  Split
 # them into smaller chunks, because Emacs on GitHub worker tends to core dump
 # when there's too much to compile in one go.
-for pattern in "modules/*.el" "init.el"; do
+for pattern in "modules/*.el" "init.el" "themes/*.el"; do
     echo "===Byte compiling: ${pattern}==="
 
     # Use find to find file names such that globs are expanded while prevent