Add Docker manifest with multiple architectures

Dockerfile.arm64v8

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+FROM arm64v8/alpine:3.9.4
+
+VOLUME /var/www/app/data
+VOLUME /var/www/app/plugins
+VOLUME /etc/nginx/ssl
+
+EXPOSE 80 443
+
+ARG VERSION
+
+RUN apk update && \
+    apk add openssl unzip nginx bash ca-certificates s6 curl ssmtp mailx php7 php7-phar php7-curl \
+    php7-fpm php7-json php7-zlib php7-xml php7-dom php7-ctype php7-opcache php7-zip php7-iconv \
+    php7-pdo php7-pdo_mysql php7-pdo_sqlite php7-pdo_pgsql php7-mbstring php7-session php7-bcmath \
+    php7-gd php7-mcrypt php7-openssl php7-sockets php7-posix php7-ldap php7-simplexml && \
+    rm -rf /var/cache/apk/* && \
+    rm -rf /var/www/localhost && \
+    rm -f /etc/php7/php-fpm.d/www.conf
+
+ADD . /var/www/app
+ADD docker/ /
+
+RUN rm -rf /var/www/app/docker && echo $VERSION > /version.txt
+
+ENTRYPOINT ["/usr/local/bin/entrypoint.sh"]
+CMD []