Dockerfile.armhf merge changes from Dockerfile

Dockerfile.armhf

@@ -3,7 +3,9 @@ MAINTAINER David Personette <[email protected]>
 
 # Install openvpn
 RUN ["cross-build-start"]
-RUN apk --no-cache add bash curl ip6tables iptables openvpn shadow && \
+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"]