Dockerfile for aarch64 (odroid c2 & pine64) (#4018)

Dockerfile.aarch64

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+FROM aarch64/alpine:3.5
+MAINTAINER atzoum@gmail.com
+
+# Install system utils & Gogs runtime dependencies
+ADD https://github.com/tianon/gosu/releases/download/1.9/gosu-arm64 /usr/sbin/gosu
+RUN chmod +x /usr/sbin/gosu \
+ && apk --no-cache --no-progress add ca-certificates bash git linux-pam s6 curl openssh socat tzdata
+
+ENV GOGS_CUSTOM /data/gogs
+
+COPY . /app/gogs/
+WORKDIR /app/gogs/
+RUN ./docker/build.sh
+
+# Configure LibC Name Service
+COPY docker/nsswitch.conf /etc/nsswitch.conf
+
+# Configure Docker Container
+VOLUME ["/data"]
+EXPOSE 22 3000
+ENTRYPOINT ["docker/start.sh"]
+CMD ["/bin/s6-svscan", "/app/gogs/docker/s6/"]