add Dockerfile and compose file with caddy support

Caddyfile

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+:80
+
+root * /usr/share/caddy
+file_server

Dockerfile

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+# syntax=docker/dockerfile:1.9
+
+FROM docker.io/node:22-alpine as BUILD
+ENV \
+  PHANPY_CLIENT_NAME="Phanpy" \
+  PHANPY_WEBSITE="https://phanpy.brothertec.eu" \
+  PHANPY_DEFAULT_INSTANCE="gts.brothertec.eu" \
+  PHANPY_DEFAULT_INSTANCE_REGISTRATION_URL="https://gts.brothertec.eu/login" \
+  PHANPY_PRIVACY_POLICY_URL="https://gts.brothertec.eu/about" \
+  PHANPY_DEFAULT_LANG="de" \
+  PHANPY_LINGVA_INSTANCES="phanpy.brothertec.eu" \
+  PHANPY_IMG_ALT_API_URL="" \
+  PHANPY_GIPHY_API_KEY=""
+WORKDIR /build
+COPY package.json package-lock.json ./
+RUN npm install
+COPY ./ ./
+RUN npm run build
+
+FROM caddy:2-alpine
+COPY --from=BUILD /build/dist/ /usr/share/caddy
+COPY Caddyfile /etc/caddy/Caddyfile

docker-compose.yml

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+services:
+  phanpy:
+    #image: ghcr.io/cheeaun/phanpy:latest
+    build:
+      context: .
+    container_name: phanpy
+    #ports:
+    #  - 8080:80
+
+    networks:
+      - caddy
+
+    labels:
+      com.centurylinklabs.watchtower.enable: true
+      caddy: phanpy.brothertec.eu
+      caddy.route.appsec: ""
+      caddy.route.crowdsec: ""
+      caddy.route.reverse_proxy: "{{upstreams 80}}"
+      caddy.encode: "zstd gzip"
+      caddy.log: ""
+      caddy.log.output: "file /logs/phanpy.brothertec.eu.log"
+      caddy.log.output.roll_size: "100MiB"
+      caddy.log.output.roll_keep: "5"
+      caddy.log.output.roll_keep_for: "100d"
+      caddy.log.format: "json"
+      caddy.log.level: "INFO"
+
+networks:
+  caddy:
+    external: true
+