add a script to publish the webzine

publish.sh

@@ -0,0 +1,15 @@
+#!/bin/sh
+
+if test -f /bsd # on OpenBSD
+then
+    cd issues && make && cd ../
+else
+    nix-shell -p gnumake libxml2 --run "cd issues && make"
+fi
+rclone sync -v --size-only \
+	--sftp-set-modtime=false \
+	--sftp-disable-hashcheck=true \
+	--sftp-disable-concurrent-writes=true \
+	--sftp-disable-concurrent-reads=true \
+	public/ \
+	webzine:webzine.puffy.cafe/