Add docker setup for caddy

Author: jpaquim

docker/caddy/Caddyfile

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+localhost
+respond "Hello, world!"

docker/caddy/Dockerfile

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+# FROM caddy:2.8.4-builder AS builder
+FROM caddy:builder AS builder
+
+RUN xcaddy build \
+    --with github.com/caddyserver/nginx-adapter
+
+# FROM caddy:2.8.4
+FROM caddy:latest
+
+COPY --from=builder /usr/bin/caddy /usr/bin/caddy

docker/caddy/compose.yml

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+services:
+  caddy:
+    # build: .
+    # image: caddy:2.8.4
+    image: caddy:latest
+    restart: unless-stopped
+    ports:
+      - "80:80"
+      - "443:443"
+      - "443:443/udp"
+    volumes:
+      - ./Caddyfile:/etc/caddy/Caddyfile
+      - ./site:/srv
+      - caddy_data:/data
+      - caddy_config:/config
+
+volumes:
+  caddy_data:
+  caddy_config: