golang-http-template: Getting `go: inconsistent vendoring` error when a module is located within function

Expected Behaviour

It should work? 🤷‍♂️

Current Behaviour

Step 17/32 : RUN CGO_ENABLED=${CGO_ENABLED} GOOS=${TARGETOS} GOARCH=${TARGETARCH}     go build --ldflags "-s -w" -a -installsuffix cgo -o handler .
 ---> Running in 56939001fb88
go: inconsistent vendoring in /go/src/handler:
	github.com/openfaas/templates-sdk@v0.0.0-20200723092016-0ebf61253625: is explicitly required in go.mod, but not marked as explicit in vendor/modules.txt
	handler/function: is replaced in go.mod, but not marked as replaced in vendor/modules.txt

run 'go mod vendor' to sync, or use -mod=mod or -mod=readonly to ignore the vendor directory
The command '/bin/sh -c CGO_ENABLED=${CGO_ENABLED} GOOS=${TARGETOS} GOARCH=${TARGETARCH}     go build --ldflags "-s -w" -a -installsuffix cgo -o handler .' returned a non-zero code: 1
[0] < Building notifier-fn done in 2.64s.
[0] Worker done.

Total build time: 2.64s
Errors received during build:
- [notifier-fn] received non-zero exit code from build, error: The command '/bin/sh -c CGO_ENABLED=${CGO_ENABLED} GOOS=${TARGETOS} GOARCH=${TARGETARCH}     go build --ldflags "-s -w" -a -installsuffix cgo -o handler .' returned a non-zero code: 1

Steps to Reproduce (for bugs)

We were following the template documentation guide as described here.

1. $ faas-cli template store pull golang-http
2. $ faas-cli new notifier-fn --lang golang-http --prefix Dentrax
3. $ cd notifier-fn
4. $ go mod init github.com/Dentrax/foo
5. Use a dependency (i.e. github.com/slack-go/slack) inside handler.go

Context

go.mod

module github.com/Dentrax/foo

go 1.16

require (
    github.com/openfaas/templates-sdk v0.0.0-20200723092016-0ebf61253625
    github.com/slack-go/slack v0.8.1
)

notifier-fn.yml:

version: 1.0
provider:
  name: openfaas
  gateway: http://foo
functions:
  notifier-fn:
    lang: golang-http
    handler: ./notifier-fn
    image: Dentrax/notifier-fn:latest
    build_args:
      GO111MODULE: on
    environment:
      SLACK_WEBHOOK_URL: https://bar

What we have tried so far that did not work

Each step we applied these in sequential:

• faas-cli up -f notifier-fn.yml

• faas-cli up -f notifier-fn.yml --build-arg GO111MODULE=on

• Single handler.go file:

• $ go mod init ...

• $ go mod vendor + $ go mod tidy? (w/ vendor dir)

• Using GO_REPLACE.txt in parent dir

Your Environment

FaaS-CLI version

CLI: commit: 6b5e7a14a598527063c7c05fb4187739b6eb6d38 version: 0.13.6

Docker version

Client: Docker Engine - Community Cloud integration: 1.0.7 Version: 20.10.2 API version: 1.41 Go version: go1.13.15 Git commit: 2291f61 Built: Mon Dec 28 16:12:42 2020 OS/Arch: darwin/amd64 Context: default Experimental: true

Server: Docker Engine - Community Engine: Version: 20.10.2 API version: 1.41 (minimum version 1.12) Go version: go1.13.15 Git commit: 8891c58 Built: Mon Dec 28 16:15:28 2020 OS/Arch: linux/amd64 Experimental: false containerd: Version: 1.4.3 GitCommit: 269548fa27e0089a8b8278fc4fc781d7f65a939b runc: Version: 1.0.0-rc92 GitCommit: ff819c7e9184c13b7c2607fe6c30ae19403a7aff docker-init: Version: 0.19.0 GitCommit: de40ad0

• Are you using Docker Swarm (FaaS-swarm ) or Kubernetes (FaaS-netes)? NO

• Operating System and version (e.g. Linux, Windows, MacOS): macOS 11.0.1

We are not sure why the given template documentation does not work as we expected. I think we are missing some important detail on the documentation. Actually, the command that failing above is passing on our local workspace: $ CGO_ENABLED=${CGO_ENABLED} GOOS=${TARGETOS} GOARCH=${TARGETARCH} go build --ldflags "-s -w" -a -installsuffix cgo -o handler . Any ideas?

cc: @developer-guy