Update to Helm 2.12.2 (#19)

A security hole was found in older Helm versions.  While this is
not exploitable in servers, it is helpful to be consistent with clients,
and clients must be upgraded.

Author: ts4z

Dockerfile

@@ -3,9 +3,9 @@ LABEL maintainer="Mario Siegenthaler <[email protected]>"
 
 RUN apk add --update --no-cache ca-certificates git
 
-ENV VERSION=v2.11.0
+ENV VERSION=v2.12.2
 ENV FILENAME=helm-${VERSION}-linux-amd64.tar.gz
-ENV SHA256SUM=02a4751586d6a80f6848b58e7f6bd6c973ffffadc52b4c06652db7def02773a1
+ENV SHA256SUM=edad6d5e594408b996b8d758a04948f89dab15fa6c6ea6daee3709f8c099df6d
 
 WORKDIR /