Add Gitea 1.26.4 Alpine package

packaging/alpine/local/gitea/gitea.pre-install

@@ -0,0 +1,7 @@
+#!/bin/sh
+
+addgroup -S www-data 2>/dev/null
+adduser -S -D -H -h /var/lib/gitea -s /sbin/nologin \
+	-G www-data -g gitea gitea 2>/dev/null
+
+exit 0