Update Go to v1.17

Signed-off-by: Aurel Canciu <aurelcanciu@gmail.com>

Dockerfile

@@ -1,4 +1,4 @@
-FROM alpine:3.14 as builder
+FROM alpine:3.15 as builder
 
 RUN apk add --no-cache ca-certificates curl
 
@@ -9,7 +9,7 @@ RUN curl -sL https://storage.googleapis.com/kubernetes-release/release/v${KUBECT
     -o /usr/local/bin/kubectl && chmod +x /usr/local/bin/kubectl && \
     kubectl version --client=true
 
-FROM alpine:3.14 as flux-cli
+FROM alpine:3.15 as flux-cli
 
 # Create minimal nsswitch.conf file to prioritize the usage of /etc/hosts over DNS queries.
 # https://github.com/gliderlabs/docker-alpine/issues/367#issuecomment-354316460