Add Go 1.13 support and upgrade Go 1.12 version (#1507)

environments/go/builder/Dockerfile-1.12

@@ -1,5 +1,5 @@
 ARG BUILDER_IMAGE=fission/builder
-ARG GO_VERSION=1.12.7
+ARG GO_VERSION=1.12
 
 FROM ${BUILDER_IMAGE}
 

environments/go/builder/Dockerfile-1.13

@@ -0,0 +1,14 @@
+ARG BUILDER_IMAGE=fission/builder
+ARG GO_VERSION=1.13
+
+FROM ${BUILDER_IMAGE}
+
+FROM golang:${GO_VERSION}
+
+ENV GOPATH /usr
+ENV GO111MODULE on
+WORKDIR ${GOPATH}
+
+COPY --from=0 /builder /builder
+ADD build.sh /usr/local/bin/build
+