Fix the build

Dockerfile

@@ -1,20 +1,15 @@
 # Build stage
-ARG GO_VERSION=1.8
-ARG PROJECT_PATH=/go/src/github.com/indeedsecurity/carbonbeat
-FROM golang:${GO_VERSION}-alpine AS builder
-RUN apk --no-cache add ca-certificates tini git gcc musl-dev
-RUN go get -u github.com/golang/dep/cmd/dep
-WORKDIR /go/src/github.com/indeedsecurity/carbonbeat
-COPY ./ ${PROJECT_PATH}
-RUN dep ensure
+FROM golang:1.15-buster as builder
+WORKDIR /build
+COPY . .
 RUN CGO_ENABLED=0 GOOS=`go env GOHOSTOS` GOARCH=`go env GOHOSTARCH` go build -o carbonbeat \
     && go test $(go list ./... | grep -v /vendor/)
 
 # Production image
-FROM alpine:3.6
+FROM alpine:3.12
 RUN apk --no-cache add ca-certificates tini
 WORKDIR /
-COPY --from=builder /go/src/github.com/indeedsecurity/carbonbeat/carbonbeat .
+COPY --from=builder /build/carbonbeat .
 RUN adduser -D -u 69999 -s /usr/sbin/nologin carbonbeat
 #USER carbonbeat
 ENTRYPOINT ["tini", "-g", "--"]

app/carbonbeat.go

@@ -99,7 +99,7 @@ func (bt *Carbonbeat) Run(b *beat.Beat) error {
 func (bt *Carbonbeat) Stop() {
 	err := bt.client.Close()
 	if err != nil {
-		logp.Critical("stopping the beat client failed because of: ", err)
+		logp.Critical(fmt.Sprintf("stopping the beat client failed because of: %s", err.Error()))
 	}
 	close(bt.done)
 }

go.sum

@@ -0,0 +1,63 @@
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