codegen.yml to use apollo-mergeable-types.js

codegen.yml

overwrite: true
schema: '../../../app/graphql/schema.graphql'
generates:
  ./src/schema-types/fragments/introspection-result.ts:
    plugins:
      - fragment-matcher
    config:
      apolloClientVersion: 3
  ./src/schema-types/fragments/apollo-mergeable-types.ts:
    plugins:
      - ./src/scripts/generate-apollo-mergeable-types.js