Modify the Makefile to pull the go utils from the $GOPATH

[dehort]

The existing approach doesn't pull the golang utils from the correct location. This approach attempts to pull them (go-jsonschema, code generator, etc) from the $GOPATH. I think this is a better approach.

[dehort]

Why is GOPATH not setup already?

[dehort]

I pushed a change that sets the GOPATH env var only if it is not set. Is this the right thing? Is that kind of sneaky/not explicit? It fixes the build on github, but maybe I should set the GOPATH env var in the github actions setup.

/home/runner/go/bin/oapi-codegen -generate server,spec -package public -o internal/api/controllers/public/spec.gen.go schema/public.openapi.yaml
/home/runner/go/bin/oapi-codegen -generate types -package public -o internal/api/controllers/public/types.gen.go schema/public.openapi.yaml
# internal API
/home/runner/go/bin/oapi-codegen -generate server,spec -package private -o internal/api/controllers/private/spec.gen.go -import-mapping=./public.openapi.yaml:playbook-dispatcher/internal/api/controllers/public schema/private.openapi.yaml
/home/runner/go/bin/oapi-codegen -generate types -package private -o internal/api/controllers/private/types.gen.go -import-mapping=./public.openapi.yaml:playbook-dispatcher/internal/api/controllers/public schema/private.openapi.yaml

[dehort]

Notes: https://laszlo.cloud/setting-gopath-in-github-actions