update dockerfile

Dockerfile

+FROM nginx:alpine
+
+LABEL maintainer="chenbowen <chenbw@fxqifu.com>"
+
+COPY nginx.conf /etc/nginx/
+
+# If you're in China, or you need to change sources, will be set CHANGE_SOURCE to true in .env.
+
+ARG CHANGE_SOURCE=false
+RUN if [ ${CHANGE_SOURCE} = true ]; then \
+    # Change application source from dl-cdn.alpinelinux.org to aliyun source
+    sed -i 's/dl-cdn.alpinelinux.org/mirrors.aliyun.com/' /etc/apk/repositories \
+;fi
+
+RUN apk update \
+    && apk upgrade \
+    && apk add --no-cache openssl \
+    && apk add --no-cache bash \
+    && adduser -D -H -u 1000 -s /bin/bash www
+
+# Set upstream conf and remove the default conf
+RUN rm /etc/nginx/conf.d/default.conf
+
+ADD ./startup.sh /opt/startup.sh
+RUN sed -i 's/\r//g' /opt/startup.sh
+CMD ["/bin/bash", "/opt/startup.sh"]
+
+EXPOSE 80 443