Bump Alpine version from v3.6 to v3.9

We have multiple nightly builds (from `44874ead` up to and including `c9cda8ab` at time of this commit) with gnupg 2.1.20-r1 baked in to them which is effected by CVE-2018-12020 (patched in >=2.2.3-r1). As there is no newer version of gnupg available in the Alpine main/v3.6 repository, and 3.6 is only receiving security updates (but with a delay?), and supports for 3.6 ends on 2019-05-01, this bump is mandatory.
fluxcd · Mar 7, 2019 · 73b3a64 · 73b3a64
1 parent c9cda8a
commit 73b3a64
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diff --git a/docker/Dockerfile.flux b/docker/Dockerfile.flux
@@ -1,4 +1,4 @@
-FROM alpine:3.6
+FROM alpine:3.9
 
 WORKDIR /home/flux
 

diff --git a/docker/Dockerfile.helm-operator b/docker/Dockerfile.helm-operator
@@ -1,4 +1,4 @@
-FROM alpine:3.6
+FROM alpine:3.9
 
 WORKDIR /home/flux