fix build

Dockerfile

@@ -6,12 +6,11 @@
 # Note that the config must have embedded certs
 # See `start` in same repo for more ideas
 
-FROM alpine
+FROM alpine:edge
 
 COPY sockd.sh /usr/local/bin/
 
 RUN true \
-    && echo "http://dl-4.alpinelinux.org/alpine/edge/testing" >> /etc/apk/repositories \
     && apk add --update-cache dante-server openvpn bash openresolv openrc \
     && rm -rf /var/cache/apk/* \
     && chmod a+x /usr/local/bin/sockd.sh \