start

.travis.yml

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+
+language: bash
+
+services:
+  - docker
+
+script:
+  - echo "$DOCKER_PASSWORD" | docker login -u "$DOCKER_USERNAME" --password-stdin docker.pkg.github.com
+  - cd hello-world
+  - docker build -t=docker.pkg.github.com/tormachris/knative-report-functions/hello-world .
+  - docker push docker.pkg.github.com/tormachris/knative-report-functions/hello-world

hello-world/Dockerfile

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+# 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:1.13 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.
+COPY . ./
+
+# Build the binary.
+RUN CGO_ENABLED=0 GOOS=linux go build -mod=readonly -v -o server
+
+# 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:3
+RUN apk add --no-cache ca-certificates
+
+# Copy the binary to the production image from the builder stage.
+COPY --from=builder /app/server /server
+
+# Run the web service on container startup.
+CMD ["/server"]

hello-world/go.mod

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+module github.com/tormachris/knative-report-functions/hello-world

hello-world/helloworld.go

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+package main
+
+import (
+  "fmt"
+  "log"
+  "net/http"
+  "os"
+)
+
+func handler(w http.ResponseWriter, r *http.Request) {
+  log.Print("Hello world received a request.")
+  target := os.Getenv("TARGET")
+  if target == "" {
+    target = "World"
+  }
+  fmt.Fprintf(w, "Hello %s!\n", target)
+}
+
+func main() {
+  log.Print("Hello world sample started.")
+
+  http.HandleFunc("/", handler)
+
+  port := os.Getenv("PORT")
+  if port == "" {
+    port = "8080"
+  }
+
+  log.Fatal(http.ListenAndServe(fmt.Sprintf(":%s", port), nil))
+}