The execution of bin/openapi3/{LANG}-petshop.sh is not included in PR checklist

[autopp]

Bug Report Checklist

• Have you provided a full/minimal spec to reproduce the issue?
• Have you validated the input using an OpenAPI validator (example)?
• What's the version of OpenAPI Generator used?
• Have you search for related issues/PRs?
• What's the actual output vs expected output?
• [Optional] Bounty to sponsor the fix (example)

Description

Current PR template requires to only run ./bin/{LANG}-petstore.sh and ./bin/security/{LANG}-petstore.sh.

• Ran the shell script under ./bin/ to update Petstore sample so that CIs can verify the change. (For instance, only need to run ./bin/{LANG}-petstore.sh and ./bin/security/{LANG}-petstore.sh if updating the {LANG} (e.g. php, ruby, python, etc) code generator or {LANG} client's mustache templates). Windows batch files can be found in .\bin\windows\.

However, in fact, ./bin/openapi3/{LANG}-petstore.sh also needs to be executed. If you push it without executing it, the CI job will fail.
For example, the job failed when I submitted #2068.
https://circleci.com/gh/OpenAPITools/openapi-generator/4649#tests/containers/2

openapi-generator version

$ git log --oneline -n 1
dd3e6c6a3b (HEAD -> master, origin/master, origin/HEAD) Use actual value of generateSourceCodeOnly in python generator. (#2015)

OpenAPI declaration file content or url

N/A

Command line used for generation

N/A

Steps to reproduce

N/A

Related issues/PRs

N/A

Suggest a fix

Would you like to add ./bin/openapi3/{LANG}-petstore.sh to the checklist in .github/PULL_REQUEST_TEMPLATE.md as well?