switch caddy to ubuntu

docker/caddy/Dockerfile

@@ -1,12 +1,42 @@
 # syntax=docker/dockerfile:1.6
 
-FROM caddy:2-builder AS builder
+FROM ubuntu:24.04 AS builder
+
+# Install build dependencies
+RUN apt-get update && apt-get install -y --no-install-recommends \
+    wget \
+    ca-certificates \
+    golang-go \
+    git \
+    && rm -rf /var/lib/apt/lists/*
+
+# Install xcaddy
+RUN wget -O /usr/local/bin/xcaddy "https://caddyserver.com/api/download?os=linux&arch=amd64&p=github.com/caddyserver/xcaddy" \
+    && chmod +x /usr/local/bin/xcaddy
+
+# Build Caddy with plugins
 RUN xcaddy build \
     --with github.com/caddy-dns/cloudflare \
-    --with github.com/mholt/caddy-l4
+    --with github.com/mholt/caddy-l4 \
+    --output /usr/bin/caddy
 
-FROM caddy:2
+FROM ubuntu:24.04
+
+# Install runtime dependencies
+RUN apt-get update && apt-get install -y --no-install-recommends \
+    ca-certificates \
+    && rm -rf /var/lib/apt/lists/*
+
+# Copy caddy binary from builder
 COPY --from=builder /usr/bin/caddy /usr/bin/caddy
 COPY docker/caddy/Caddyfile /etc/caddy/Caddyfile
 
+# Create caddy user and directories
+RUN groupadd -g 1000 caddy && useradd -r -u 1000 -g caddy caddy \
+    && mkdir -p /data /config \
+    && chown -R caddy:caddy /data /config
+
 EXPOSE 80 443 2019
+
+USER caddy
+CMD ["caddy", "run", "--config", "/etc/caddy/Caddyfile", "--adapter", "caddyfile"]