build: update Go to v1.14 and Alpine to v3.11

.circleci/config.yml

@@ -3,7 +3,7 @@ jobs:
 
   build-binary:
     docker:
-      - image: circleci/golang:1.13
+      - image: circleci/golang:1.14
     working_directory: ~/build
     steps:
       - checkout
@@ -47,7 +47,7 @@ jobs:
 
   push-container:
     docker:
-      - image: circleci/golang:1.13
+      - image: circleci/golang:1.14
     steps:
       - checkout
       - setup_remote_docker:
@@ -59,7 +59,7 @@ jobs:
 
   push-binary:
     docker:
-      - image: circleci/golang:1.13
+      - image: circleci/golang:1.14
     working_directory: ~/build
     steps:
       - checkout
@@ -175,7 +175,7 @@ jobs:
 
   push-helm-charts:
     docker:
-      - image: circleci/golang:1.13
+      - image: circleci/golang:1.14
     steps:
       - checkout
       - run:

Dockerfile

@@ -1,4 +1,4 @@
-FROM alpine:3.10
+FROM alpine:3.11
 
 RUN addgroup -S flagger \
     && adduser -S -g flagger flagger \

go.mod

@@ -1,6 +1,6 @@
 module github.com/weaveworks/flagger
 
-go 1.13
+go 1.14
 
 require (
 	github.com/Masterminds/semver/v3 v3.0.3