Fix.

document/build.sh

@@ -32,7 +32,7 @@ shift $((OPTIND-1))
 mkdir -p ${OUTDIR}/tmp
 mv ${OUTDIR}/*.pdf ${OUTDIR}/tmp || true
 rm -f ${OUTDIR}/*.*
-mv ${OUTDIR}/tmp/*.pdf ${OUTDIR}
+mv ${OUTDIR}/tmp/*.pdf ${OUTDIR} || true
 rm -rf ${OUTDIR}/tmp
 
 if [ -n "$CI_BUILD_REF" ];