update docker build flow

Author: Oleg Sucharevich

.dockerignore

@@ -1,7 +1,15 @@
-FROM golang:latest as builder
+FROM golang:1.10-alpine3.8 as builder
+
+# Add basic tools
+RUN apk add --no-cache --update curl bash make git
+
 RUN mkdir -p /go/src/github.com/codefresh-io/stevedore
 WORKDIR /go/src/github.com/codefresh-io/stevedore
+
+ENV GOPATH /go
 COPY . .
+
+# Build binary
 RUN "./scripts/BUILD.sh"
 
 
@@ -10,6 +18,8 @@ FROM alpine:3.6
 RUN apk add --no-cache ca-certificates
 
 COPY --from=builder /go/src/github.com/codefresh-io/stevedore/dist/bin/stevedore /usr/bin/stevedore
+
+
 ENV PATH $PATH:/usr/bin/stevedore
 ENTRYPOINT ["stevedore"]