[WIP]TEST ONLY, DO NOT MERGE

docs/serving/samples/hello-world/helloworld-go/Dockerfile

@@ -1,24 +1,30 @@
 # Use the offical Golang image to create a build artifact.
 # This is based on Debian and sets the GOPATH to /go.
 # https://hub.docker.com/_/golang
-FROM golang:1.12 as builder
+FROM golang:1.13 as builder
+
+# Create and change to the app directory.
+WORKDIR /app
+
+# Retrieve application dependencies.
+# This allows the container build to reuse cached dependencies.
+COPY go.* ./
+RUN go mod download
 
 # Copy local code to the container image.
-WORKDIR /go/src/github.com/knative/docs/helloworld
-COPY . .
+COPY . ./
 
-# Build the command inside the container.
-# (You may fetch or manage dependencies here,
-# either manually or with a tool like "godep".)
-RUN CGO_ENABLED=0 GOOS=linux go build -v -o helloworld
+# Build the binary.
+RUN CGO_ENABLED=0 GOOS=linux go build -v -o server
 
-# Use a Docker multi-stage build to create a lean production image.
+# Use the official Alpine image for a lean production container.
+# https://hub.docker.com/_/alpine
 # https://docs.docker.com/develop/develop-images/multistage-build/#use-multi-stage-builds
-FROM alpine
+FROM alpine:3
 RUN apk add --no-cache ca-certificates
 
 # Copy the binary to the production image from the builder stage.
-COPY --from=builder /go/src/github.com/knative/docs/helloworld/helloworld /helloworld
+COPY --from=builder /app/server /server
 
 # Run the web service on container startup.
-CMD ["/helloworld"]
+CMD ["/server"]

docs/serving/samples/hello-world/helloworld-go/go.mod

@@ -0,0 +1,3 @@
+module github.com/knative/docs/docs/serving/samples/hello-world/helloworld-go
+
+go 1.13

test/e2e/sampleapptestbase.go

@@ -108,6 +108,8 @@ func prepareWorkDir(t *testing.T, srcDir, workDir string, preCommands []sampleap
 
 func pushDockerImage(t *testing.T, imagePath, workDir string) {
 	t.Logf("Pushing docker image to: '%s'", imagePath)
+	t.Logf("image path is: %s", imagePath)
+	t.Logf("work dir is: %s", workDir)
 	if output, err := exec.Command("docker", "build", "-t", imagePath, workDir).CombinedOutput(); err != nil {
 		t.Fatalf("Error building docker image: %v", strings.TrimSpace(string(output)))
 	}

test/sampleapp/config.yaml

@@ -14,6 +14,7 @@ languages:
       - "helloworld.go"
       - "service.yaml"
       - "Dockerfile"
+      - "go.mod"
   - language: "kotlin"
     expectedOutput: "Hello Kotlin Sample v1!"
     copies: