fix: long name resolution

Dockerfile

@@ -1,4 +1,4 @@
-FROM caddy:2.7.5-builder AS builder
+FROM docker.io/caddy:2.7.6-builder AS builder
 
 #
 ## build with additional plugins
@@ -8,6 +8,6 @@ RUN xcaddy build \
     --with github.com/mholt/caddy-dynamicdns \
     --with github.com/greenpau/caddy-security
 
-FROM caddy:2.7.5
+FROM docker.io/caddy:2.7.6
 
 COPY --from=builder /usr/bin/caddy /usr/bin/caddy