Fix: default DISABLE_IPV6 to false to avoid "entrypoint.sh: line 36: DISABLE_IPV6: unbound variable"

Author: rpardini

Dockerfile

@@ -117,5 +117,8 @@ ENV PROXY_CONNECT_READ_TIMEOUT="60s"
 ENV PROXY_CONNECT_CONNECT_TIMEOUT="60s"
 ENV PROXY_CONNECT_SEND_TIMEOUT="60s"
 
+# Allow disabling IPV6 resolution, default to false
+ENV DISABLE_IPV6="false"
+
 # Did you want a shell? Sorry, the entrypoint never returns, because it runs nginx itself. Use 'docker exec' if you need to mess around internally.
 ENTRYPOINT ["/entrypoint.sh"]