Add flask-openapi3

[luolingchun]

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fixes #21091

[conda-forge-linter]

Hi! This is the friendly automated conda-forge-linting service.

I was trying to look for recipes to lint for you, but couldn't find any.
Please ping the 'conda-forge/core' team (using the @ notation in a comment) if you believe this is a bug.

[conda-forge-linter]

Hi! This is the friendly automated conda-forge-linting service.

I wanted to let you know that I linted all conda-recipes in your PR (recipes/flask-openapi3) and found some lint.

Here's what I've got...

For recipes/flask-openapi3:

• license_file entry is missing, but is required.
• requirements: run: Flask>=2.0 must contain a space between the name and the pin, i.e. Flask >=2.0
• requirements: run: pydantic>=1.2 must contain a space between the name and the pin, i.e. pydantic >=1.2

[conda-forge-linter]

Hi! This is the friendly automated conda-forge-linting service.

I wanted to let you know that I linted all conda-recipes in your PR (recipes/flask-openapi3) and found some lint.

Here's what I've got...

For recipes/flask-openapi3:

• license_file entry is missing, but is required.

[conda-forge-linter]

Hi! This is the friendly automated conda-forge-linting service.

I just wanted to let you know that I linted all conda-recipes in your PR (recipes/flask-openapi3) and found it was in an excellent condition.

[TangoTom]

Just installed the package and saw that dependant package (e.g. jinja2, pydantic) will be installed via pip although they exist in conda-forge. I would like to correct that but I am unsure how to accomplish that.
Any advice or example would be great.

[luolingchun]

@TangoTom I did a testing in docker, it's worked.

[TangoTom]

Thanks, good to know. So I think I need to check my local channels.