added docker file for go-server generator

Author: HugoMario

modules/swagger-codegen/src/main/java/io/swagger/codegen/languages/GoServerCodegen.java

@@ -100,6 +100,7 @@ public void processOpts() {
          * it will be processed by the template engine.  Otherwise, it will be copied
          */
         supportingFiles.add(new SupportingFile("swagger.mustache", "api", "swagger.yaml"));
+        supportingFiles.add(new SupportingFile("Dockerfile", "", "Dockerfile"));
         supportingFiles.add(new SupportingFile("main.mustache", "", "main.go"));
         supportingFiles.add(new SupportingFile("routers.mustache", apiPath, "routers.go"));
         supportingFiles.add(new SupportingFile("logger.mustache", apiPath, "logger.go"));

modules/swagger-codegen/src/main/resources/go-server/Dockerfile

@@ -0,0 +1,14 @@
+FROM golang:1.10 AS build
+WORKDIR /go/src
+COPY go ./go
+COPY main.go .
+
+ENV CGO_ENABLED=0
+RUN go get -d -v ./...
+
+RUN go build -a -installsuffix cgo -o swagger .
+
+FROM scratch AS runtime
+COPY --from=build /go/src/swagger ./
+EXPOSE 8080/tcp
+ENTRYPOINT ["./swagger"]