Bump guestbook-go image to v4 updating golang to 1.22.3 and now builds a Go module

guestbook-go/Dockerfile

@@ -12,12 +12,10 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-FROM golang:1.10.0
-RUN go get github.com/codegangsta/negroni \
-           github.com/gorilla/mux \
-           github.com/xyproto/simpleredis/v2
+FROM golang:1.22.3
 WORKDIR /app
-ADD ./main.go .
+COPY go.mod go.sum ./main.go ./
+RUN go mod download
 RUN CGO_ENABLED=0 GOOS=linux go build -o main .
 
 FROM scratch

guestbook-go/Makefile

@@ -16,13 +16,21 @@
 
 # Usage:
 #   [VERSION=v3] [REGISTRY="staging-k8s.gcr.io"] make build
-VERSION?=v3
+VERSION?=v4
 REGISTRY?=staging-k8s.gcr.io
 
 release: clean build push clean
 
+# validates changes in go.mod and resolves Go module's dependency details
+go.sum: go.mod
+	go mod tidy
+
+# creates a go module in the directory
+go.mod:
+	go mod init example.com/k8s-examples/guestbook
+
 # builds a docker image that builds the app and packages it into a minimal docker image
-build:
+build: go.sum
 	docker buildx build --load -t ${REGISTRY}/guestbook:${VERSION} .
 
 # push the image to an registry

guestbook-go/go.mod

@@ -0,0 +1,14 @@
+module example.com/k8s-examples/guestbook
+
+go 1.22.3
+
+require (
+	github.com/codegangsta/negroni v1.0.0
+	github.com/gorilla/mux v1.8.1
+	github.com/xyproto/simpleredis/v2 v2.6.5
+)
+
+require (
+	github.com/gomodule/redigo v1.8.9 // indirect
+	github.com/xyproto/pinterface v1.5.3 // indirect
+)

guestbook-go/go.sum

@@ -0,0 +1,20 @@
+github.com/codegangsta/negroni v1.0.0 h1:+aYywywx4bnKXWvoWtRfJ91vC59NbEhEY03sZjQhbVY=
+github.com/codegangsta/negroni v1.0.0/go.mod h1:v0y3T5G7Y1UlFfyxFn/QLRU4a2EuNau2iZY63YTKWo0=
+github.com/davecgh/go-spew v1.1.0 h1:ZDRjVQ15GmhC3fiQ8ni8+OwkZQO4DARzQgrnXU1Liz8=
+github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/gomodule/redigo v1.8.9 h1:Sl3u+2BI/kk+VEatbj0scLdrFhjPmbxOc1myhDP41ws=
+github.com/gomodule/redigo v1.8.9/go.mod h1:7ArFNvsTjH8GMMzB4uy1snslv2BwmginuMs06a1uzZE=
+github.com/gorilla/mux v1.8.1 h1:TuBL49tXwgrFYWhqrNgrUNEY92u81SPhu7sTdzQEiWY=
+github.com/gorilla/mux v1.8.1/go.mod h1:AKf9I4AEqPTmMytcMc0KkNouC66V3BtZ4qD5fmWSiMQ=
+github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
+github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
+github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
+github.com/stretchr/testify v1.7.0 h1:nwc3DEeHmmLAfoZucVR881uASk0Mfjw8xYJ99tb5CcY=
+github.com/stretchr/testify v1.7.0/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
+github.com/xyproto/pinterface v1.5.3 h1:RKkNT88cwrSqD9hU4cYAO5yeo8srg4TG+74Pcj88iz0=
+github.com/xyproto/pinterface v1.5.3/go.mod h1:X5B5pKE49ak7SpyDh5QvJvLH9cC9XuZNDcl5hEyYc34=
+github.com/xyproto/simpleredis/v2 v2.6.5 h1:PtAz5j2UUACNHx5LetI60dbCsVMhIv1H878bND4VQK4=
+github.com/xyproto/simpleredis/v2 v2.6.5/go.mod h1:OrWVubZGr0SbpAjkAQkFn/iiex2AsblBm80uhYxbjQY=
+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c h1:dUUwHk2QECo/6vqA44rthZ8ie2QXMNeKRTHCNY2nXvo=
+gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=