Use official alpine-fat in alpine Dockerfile
diff --git a/alpine/Dockerfile b/alpine/Dockerfile
index 4e96294..fc0be2f 100644
--- a/alpine/Dockerfile
+++ b/alpine/Dockerfile
@@ -1,23 +1,25 @@
-ARG RESTY_IMAGE_BASE="vkill/openresty"
-ARG RESTY_IMAGE_TAG="alpine-fat-with-pcre"
-
+ARG RESTY_IMAGE_BASE="openresty/openresty"
+ARG RESTY_IMAGE_TAG="alpine-fat"
+# require alpine-fat >= 1.15.8.1-3
 FROM ${RESTY_IMAGE_BASE}:${RESTY_IMAGE_TAG}
 
 MAINTAINER vkill <vkill.net@gmail.com>
 
-# or master
+#
+# docker build -t apisix:v0.5-alpine -f alpine/Dockerfile alpine
+# docker build -t apisix:dev-alpine --build-arg APISIX_VERSION=master --build-arg APISIX_DOWNLOAD_SHA256=SKIP -f alpine/Dockerfile alpine
+# docker build -t apisix:my-alpine --build-arg APISIX_GITHUB_REPO=https://github.com/YOU/apisix --build-arg APISIX_VERSION=BRANCHNAME --build-arg APISIX_DOWNLOAD_SHA256=SKIP -f alpine/Dockerfile alpine
+#
 ARG APISIX_VERSION=v0.5
 ENV APISIX_VERSION=${APISIX_VERSION}
-
-ENV APISIX_DOWNLOAD_URL https://github.com/iresty/apisix/archive/${APISIX_VERSION}.zip
-
-# or SKIP
+ARG APISIX_GITHUB_REPO=https://github.com/iresty/apisix
+ENV APISIX_DOWNLOAD_URL ${APISIX_GITHUB_REPO}/archive/${APISIX_VERSION}.zip
 ARG APISIX_DOWNLOAD_SHA256=e6f14dcd58c5ba286ee48f8482a669893560bc2fbc90d6bf52881493ce720fb7
 ENV APISIX_DOWNLOAD_SHA256=${APISIX_DOWNLOAD_SHA256}
 
 RUN set -ex \
   \
-  && sed -i 's!dl-cdn.alpinelinux.org!mirrors.aliyun.com!' /etc/apk/repositories \
+  # && sed -i 's!dl-cdn.alpinelinux.org!mirrors.aliyun.com!' /etc/apk/repositories \
   \
   && apk add --no-cache --virtual .rundeps \
     curl \
@@ -35,6 +37,11 @@
     cmake \
   \
   && ln -sf /usr/local/openresty/luajit/bin/luajit /usr/bin/lua \
+  && mkdir -p /usr/local/lib/pkgconfig \
+  && mkdir -p /usr/local/include \
+  && ln -sf /usr/local/openresty/pcre/lib/libpcre.so /usr/local/lib/libpcre.so \
+  && ln -sf /usr/local/openresty/pcre/lib/pkgconfig/libpcre.pc /usr/local/lib/pkgconfig/libpcre.pc \
+  && ln -sf /usr/local/openresty/pcre/include/pcre.h /usr/local/include/pcre.h \
   \
   && wget -O apisix.zip "${APISIX_DOWNLOAD_URL}" \
   && [[ "${APISIX_DOWNLOAD_SHA256}" = "SKIP" ]] && echo "SKIP" || (echo "${APISIX_DOWNLOAD_SHA256} *apisix.zip" | sha256sum -c -) \