Use Alpine 3.10.2

Bjørn Sørensen · Bjørn Sørensen · commit 6c6887bdbbf1 · 2019-10-07T15:09:35.000+02:00
The previous version 3.10.3 was a mistake and is not available.
diff --git a/Dockerfile-goreleaser b/Dockerfile-goreleaser
@@ -1,4 +1,4 @@
-FROM alpine:3.10.3 as builder
+FROM alpine:3.10.2 as builder
 
 RUN apk update
 RUN apk add ca-certificates
