Fix broken curl in docker builder container

SeanTAllen · SeanTAllen · commit 6d66304f3192 · 2019-08-06T14:22:36.000-04:00
[skip ci]
diff --git a/.ci-dockerfiles/docker-builder/Dockerfile b/.ci-dockerfiles/docker-builder/Dockerfile
@@ -1,5 +1,7 @@
 FROM docker:17.05.0-ce-git
 
-RUN apk add --update \
+RUN apk update \
+  && apk upgrade \
+  && apk add --update \
     bash \
     curl
