Mixin errors out when Porter attempts to get schema

[vdice]

It looks like this mixin is erroring out when Porter attempts to get its schema; because of this, the mixin isn't added to the global Porter schema and thus VSCode/auto-complete thinks usage of helm3 is invalid (because it isn't in the mixin list in Porter's schema).

(At least, I think that's roughly the problem 😄)

$ porter mixin install helm3 --feed-url https://mchorfa.github.io/porter-helm3/atom.xml
installed helm3 mixin v0.1.15-1-g502102c (502102c)

# This emulates what Porter will run to get the mixin schema
$ ~/.porter/mixins/helm3/helm3 schema
Error: stat /Users/vdice/go/src/github.com/MChorfa/porter-helm3/schema/schema.json: no such file or directory
err: stat /Users/vdice/go/src/github.com/MChorfa/porter-helm3/schema/schema.json: no such file or directory

However, note that when building this mixin locally and installing, no error occurs:

 $ make build install
GO111MODULE=on go mod tidy
GO111MODULE=on go generate ./...
mkdir -p bin/mixins/helm3
GO111MODULE=on go build -ldflags '-w -X github.com/MChorfa/porter-helm3/pkg.Version=v0.1.15-2-g4f18e33 -X github.com/MChorfa/porter-helm3/pkg.Commit=4f18e33' -o bin/mixins/helm3/helm3 ./cmd/helm3
mkdir -p bin/mixins/helm3
GOARCH=amd64 GOOS=linux GO111MODULE=on go build -ldflags '-w -X github.com/MChorfa/porter-helm3/pkg.Version=v0.1.15-2-g4f18e33 -X github.com/MChorfa/porter-helm3/pkg.Commit=4f18e33' -o bin/mixins/helm3/helm3-runtime ./cmd/helm3
cd pkg/helm3 && packr2 clean
# @porter mixin uninstall helm3
mkdir -p /Users/vdice/.porter/mixins/helm3/runtimes
install bin/mixins/helm3/helm3 /Users/vdice/.porter/mixins/helm3/helm3
install bin/mixins/helm3/helm3-runtime /Users/vdice/.porter/mixins/helm3/runtimes/helm3-runtime
# @porter mixin list

$ ~/.porter/mixins/helm3/helm3 schema
{
  "$schema":"http://json-schema.org/draft-07/schema#",
  "definitions":{
    "installStep":{
      "type":"object",
      "properties":{
        "helm3":{
...

[carolynvs]

I have an open PR to fix helm3's schema: #39