lock to Cady 2.9

2.10 doesn't build caddy-dns/gandi#12

Author: nexus-uw

Dockerfile

@@ -1,10 +1,10 @@
-FROM caddy:2-builder-alpine AS builder
+FROM caddy:2.9-builder-alpine AS builder
 
 RUN xcaddy build \
     --with github.com/caddy-dns/gandi@master --with github.com/caddy-dns/cloudflare@master --with github.com/caddyserver/cache-handler@master
 
 
-FROM caddy:2-alpine
+FROM caddy:2.9-alpine
 
 ENV GANDI_API_TOKEN SETMEUP