ENH: Add link checker GitHub Action

[mmcky]

This PR runs a link checker on:

1. schedule (daily),
2. on the creation or reopening of a PR (so only will run once)

[github-actions]

🚀 Deployed on https://631fd3860a7e9222b63a751c--nostalgic-wright-5fa355.netlify.app

[mmcky]

@HumphreyYang do you have time to do the same with this lecture set? Fixing broken for now is ok.

linkcheck-reports-2.zip

Note: this is now passing as link checker only runs when a PR is opened / reopened.

[mmcky]

@HumphreyYang no rush but when you get a chance to push these can you ping me to review. Thanks.

[HumphreyYang]

Hi @mmcky,

Thank you so much for your reminder. There are several issues with the following links:

For these two links, I could not find the _dowloads repository under the https://quantecon.org/lectures/.

linear_algebra.md:841: [broken] https://lectures.quantecon.org/_downloads/course_notes.pdf: 404 Client Error: Not Found for url: https://quantecon.org/lectures/_downloads/course_notes.pdf

mle.md:138: [broken] https://lectures.quantecon.org/_downloads/mle/fp.dta: 404 Client Error: Not Found for url: https://quantecon.org/lectures/_downloads/mle/fp.dta

These two links seem to be working. I think the false positive may be related to the request

ols.md:50: [broken] https://economics.mit.edu/files/4123: HTTPSConnectionPool(host='economics.mit.edu', port=443): Max retries exceeded with url: /files/4123 (Caused by SSLError(SSLCertVerificationError(1, '[SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed: unable to get local issuer certificate (_ssl.c:1129)')))

ols.md:89: [broken] https://economics.mit.edu/faculty/acemoglu/data/ajr2001: HTTPSConnectionPool(host='economics.mit.edu', port=443): Max retries exceeded with url: /faculty/acemoglu/data/ajr2001 (Caused by SSLError(SSLCertVerificationError(1, '[SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed: unable to get local issuer certificate (_ssl.c:1129)')))

Could you please help me to resolve these issues?

Many thanks in advance.

[mmcky]

For these two links, I could not find the _dowloads repository under the https://quantecon.org/lectures/.

@HumphreyYang these files should be now located in _static/lecture_specific/{lecture-name}

https://github.com/QuantEcon/lecture-python.myst/tree/main/lectures/_static/lecture_specific/linear_models

[mmcky]

@HumphreyYang looks like the https requests for these links aren't valid.

Perhaps we can revert these to http?

https://economics.mit.edu/ -> http://economics.mit.edu/

[HumphreyYang]

Hi @mmcky,

I think the linker checking has been passed on this repo. Please kindly review the changes and merge if it looks good to you.

Many thanks.

[mmcky]

thanks @HumphreyYang