Add php

Dockerfile

@@ -16,9 +16,11 @@ RUN xcaddy build --with github.com/caddy-dns/cloudflare --output /usr/bin/caddy
 
 RUN /usr/bin/caddy version
 
-FROM caddy:${version}
+FROM alpine:3
 LABEL maintainer "Fabian Stamm <dev@fabianstamm.de>"
 
+RUN echo http://dl-cdn.alpinelinux.org/alpine/v3.9/community >> /etc/apk/repositories
+RUN apk add --no-cache php7 php7-fpm php7-opcache php7-curl php7-json php7-zip
 
 COPY --from=builder /usr/bin/caddy /usr/bin/caddy