Add goarch & cgo_enabled build flags

Author: eversC

.circleci/config.yml

@@ -36,7 +36,7 @@ jobs:
           command: |
             export GO111MODULE=on
             go mod download
-            GOOS=linux go build
+            GOOS=linux GOARCH=amd64 CGO_ENABLED=0 go build
             docker build -t ovotech/cloud-key-rotator:latest .
             echo $DOCKER_PASS | docker login -u=$DOCKER_USER --password-stdin
             docker push ovotech/cloud-key-rotator