try recommended build

Dockerfile

@@ -1,36 +1,15 @@
-# Caddy
-FROM golang:buster AS caddy-compiler
+ARG CADDY_VERSION=2.7.6
+FROM caddy:${CADDY_VERSION}-builder AS builder
 
-WORKDIR /usr/local/src
+RUN xcaddy build \
+    --with github.com/lucaslorentz/caddy-docker-proxy/v2 \
+    --with github.com/gamalan/caddy-tlsredis \
+    --with github.com/caddy-dns/gandi
 
-RUN apt-get update && apt-get install -y debian-keyring debian-archive-keyring apt-transport-https curl && \
-	curl -1sLf 'https://dl.cloudsmith.io/public/caddy/xcaddy/gpg.key' | gpg --dearmor -o /usr/share/keyrings/caddy-xcaddy-archive-keyring.gpg && \
-	curl -1sLf 'https://dl.cloudsmith.io/public/caddy/xcaddy/debian.deb.txt' | tee /etc/apt/sources.list.d/caddy-xcaddy.list && \
-	apt-get update && \
-	apt-get install -y xcaddy && \
-	xcaddy build \
-		--output /usr/local/bin/caddy \
-		--with github.com/shcorya/caddy-docker-proxy \
-		--with github.com/gamalan/caddy-tlsredis
+FROM caddy:${CADDY_VERSION}-alpine
 
-# Default Certificates 
-FROM alpine:3.14 AS alpine
-RUN apk add -U --no-cache ca-certificates
+COPY --from=builder /usr/bin/caddy /usr/bin/caddy
 
-#####################
-# primary container #
-#####################
-FROM debian:bookworm-slim
-
-EXPOSE 80
-EXPOSE 443
-EXPOSE 2019
-
-WORKDIR /usr/local/src
-
-COPY --from=caddy-compiler /usr/local/bin/caddy /usr/local/bin/caddy
-COPY --from=alpine /etc/ssl/certs/ca-certificates.crt /etc/ssl/certs/
-
-ENTRYPOINT ["/usr/local/bin/caddy"]
+ENTRYPOINT ["/usr/bin/caddy"]
 
 CMD ["docker-proxy"]