removed find -regex and merged pattern into awk command

basically this means that rivet works on alpine (busybox)

makefile

@@ -1,4 +1,4 @@
-VERSION = 0.3
+VERSION = 0.3.1
 PREFIX = /usr/local
 MANPREFIX = ${PREFIX}/share/man
 

rivet.sh

@@ -1,4 +1,4 @@
-#!/bin/sh -e
+#!/bin/sh
 
 # Copyright (c) 2021 Alessandro Mauri
 #
@@ -169,8 +169,7 @@ cp -r "$srcdir"/* "$destdir"
 rm -f "$destdir"/_header.html "$destdir"/_footer.html "$destdir"/_metadata.html
 
 # Generate an ordered (by open time) file list
-find "$srcdir" -type f -regex '.*\/[^_].+\..*' -exec ls -1t {} + |
+find "$srcdir" -type f -exec ls -1t {} + | awk '/^.*\/[^_].+\.(md|html)$/' > "$objlist"
-	awk '/.*\.(md|html)$/' > "$objlist"
 rm -f "$objdate"
 while IFS="" read -r file; do
 	stat -c '%y' "$file" >>  "$objdate"