release: Add openwrt packages

.fpm_openwrt

@@ -0,0 +1,30 @@
+-s dir
+--name sing-box
+--category net
+--license GPL-3.0-or-later
+--description "The universal proxy platform."
+--url "https://sing-box.sagernet.org/"
+--maintainer "nekohasekai <contact-git@sekai.icu>"
+--no-deb-generate-changes
+
+--config-files /etc/config/sing-box
+--config-files /etc/sing-box/config.json
+
+--depends ca-bundle
+--depends kmod-inet-diag
+--depends kmod-tun
+--depends firewall4
+
+--before-remove release/config/openwrt.prerm
+
+release/config/config.json=/etc/sing-box/config.json
+
+release/config/openwrt.conf=/etc/config/sing-box
+release/config/openwrt.init=/etc/init.d/sing-box
+release/config/openwrt.keep=/lib/upgrade/keep.d/sing-box
+
+release/completions/sing-box.bash=/usr/share/bash-completion/completions/sing-box.bash
+release/completions/sing-box.fish=/usr/share/fish/vendor_completions.d/sing-box.fish
+release/completions/sing-box.zsh=/usr/share/zsh/site-functions/_sing-box
+
+LICENSE=/usr/share/licenses/sing-box/LICENSE