Fix Skaffold pipelines for client projects (#2244)

* Update greeter references to helloworld

* Add new client command

With this change, Gomu users will be able to generate template projects
for clients to services. Additionally vendor support has been built in
so Gomu users can now generate projects using fully qualified package
names, for example:

```bash
gomu new service github.com/auditemarlow/helloworld
```

This will create a new service project `helloworld` with its module name
already set to `github.com/auditemarlow/helloworld`. Likewise, Gomu
users can then generate client projects in the same manner:

```bash
gomu new client github.com/auditemarlow/helloworld
```

This will create a `helloworld-client` project that uses the protobufs
found in the `github.com/auditemarlow/helloworld` service. This removes
at least some strain in configuring these module dependencies yourself;
you can just scaffold them outright from the start.

Although the default client project is highly opinionated, it works
straight out of the box and has Skaffold in mind. Gomu users should be
able to get going in a matter of seconds.

* Update README

* Fix Skaffold pipeline for generated client projects

cmd/gomu/cmd/cli/new/new.go

@@ -29,6 +29,7 @@ type config struct {
 	Comments []string
 	Dir      string
 	Vendor   string
+	Client   bool
 	Jaeger   bool
 	Skaffold bool
 }
@@ -148,6 +149,7 @@ func createProject(ctx *cli.Context, pt string) error {
 		Alias:    name,
 		Dir:      dir,
 		Vendor:   vendor,
+		Client:   pt == "client",
 		Jaeger:   ctx.Bool("jaeger"),
 		Skaffold: ctx.Bool("skaffold"),
 	}

cmd/gomu/cmd/cli/new/template/docker.go

@@ -6,7 +6,7 @@ ENV CGO_ENABLED=0 GOOS=linux
 WORKDIR /go/src/{{.Alias}}
 RUN apk --update --no-cache add ca-certificates gcc libtool make musl-dev protoc
 COPY . /go/src/{{.Alias}}
-RUN make init proto tidy build
+RUN make {{if not .Client}}init proto {{end}}tidy build
 
 FROM scratch
 COPY --from=builder /etc/ssl/certs /etc/ssl/certs

cmd/gomu/cmd/cli/new/template/kubernetes.go

@@ -7,7 +7,7 @@ var KubernetesEnv = `---
 apiVersion: v1
 kind: ConfigMap
 metadata:
-  name: {{.Alias}}-env
+  name: {{.Dir}}-env
 data:
   MICRO_REGISTRY: kubernetes
 `
@@ -56,23 +56,23 @@ var KubernetesDeployment = `---
 apiVersion: apps/v1
 kind: Deployment
 metadata:
-  name: {{.Alias}}
+  name: {{.Dir}}
   labels:
-    app: {{.Alias}}
+    app: {{.Dir}}
 spec:
   replicas: 1
   selector:
     matchLabels:
-      app: {{.Alias}}
+      app: {{.Dir}}
   template:
     metadata:
       labels:
-        app: {{.Alias}}
+        app: {{.Dir}}
     spec:
       containers:
-      - name: {{.Alias}}
-        image: {{.Alias}}:latest
+      - name: {{.Dir}}
+        image: {{.Dir}}:latest
         envFrom:
         - configMapRef:
-            name: {{.Alias}}-env
+            name: {{.Dir}}-env
 `

cmd/gomu/cmd/cli/new/template/module.go

@@ -11,7 +11,7 @@ require (
 
 // This can be removed once etcd becomes go gettable, version 3.4 and 3.5 is not,
 // see https://github.com/etcd-io/etcd/issues/11154 and https://github.com/etcd-io/etcd/issues/11931.
-replace google.golang.org/grpc => google.golang.org/grpc v1.26.0{{if .Vendor}}
+replace google.golang.org/grpc => google.golang.org/grpc v1.26.0{{if .Vendor}}{{if not .Skaffold}}
 
-replace {{.Vendor}}{{lower .Alias}} => ../{{lower .Alias}}{{end}}
+replace {{.Vendor}}{{lower .Alias}} => ../{{lower .Alias}}{{end}}{{end}}
 `

cmd/gomu/cmd/cli/new/template/skaffold.go

@@ -6,10 +6,10 @@ var SkaffoldCFG = `---
 apiVersion: skaffold/v2beta21
 kind: Config
 metadata:
-  name: {{.Alias}}
+  name: {{.Dir}}
 build:
   artifacts:
-  - image: {{.Alias}}
+  - image: {{.Dir}}
 deploy:
   kubectl:
     manifests: