Dockerfile.aarch64 initial add

Dockerfile.aarch64

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+FROM resin/aarch64-alpine
+MAINTAINER David Personette <[email protected]>
+
+# Install openvpn
+RUN ["cross-build-start"]
+RUN apk --no-cache --no-progress upgrade && \
+    apk --no-cache --no-progress add bash curl ip6tables iptables openvpn \
+                shadow && \
+    addgroup -S vpn && \
+    rm -rf /tmp/*
+RUN ["cross-build-end"]
+
+COPY openvpn.sh /usr/bin/
+
+HEALTHCHECK --interval=60s --timeout=15s --start-period=120s \
+             CMD curl -L 'https://api.ipify.org'
+
+VOLUME ["/vpn"]
+
+ENTRYPOINT ["openvpn.sh"]