linkcheck hangs in GitHub but not locally

[bburtin]

linkcheck hangs during crawling when I run it in a GitHub Action. Strangely it works fine when I run the same command locally. This is the Docker Compose block that I'm using:

  check-internal-links:
    image: tennox/linkcheck:3.0.0
    depends_on: [burtin-website]
    command: -d http://burtin-website

The command is docker compose -f compose-prod.yaml run check-internal-links. In CI I see this:

...
- completely new destination: http://burtin-website/fonts/FiraCode-LatinExt.woff2
- completely new destination: http://burtin-website/fonts/FiraCode-Latin.woff2
Added: http://burtin-website/css/code.min.4f0ccc8439f99bf7f7970298556b94011aabc1fcae743b6842fc3361a2da9ea3.css to Worker<0> with 99ms delay
Done checking: http://burtin-website/css/code.min.4f0ccc8439f99bf7f7970298556b94011aabc1fcae743b6842fc3361a2da9ea3.css (HTTP 200) => 0 links
Added: http://burtin-website/css/buttons.min.86f6b4c106b6c6eb690ae5203d36b442c1f66f718ff4e8164fa86cf6c61ad641.css to Worker<0> with 99ms delay
Done checking: http://burtin-website/css/buttons.min.86f6b4c106b6c6eb690ae5203d36b442c1f66f718ff4e8164fa86cf6c61ad641.css (HTTP 200) => 0 links
Added: http://burtin-website/favicon.png to Worker<0> with 98ms delay
Done checking: http://burtin-website/favicon.png (HTTP 200) => 0 links
Added: http://burtin-website/apple-touch-icon.png to Worker<0> with 99ms delay
Done checking: http://burtin-website/apple-touch-icon.png (HTTP 200) => 0 links

Then nothing happens. When I run the same command locally I see

...
- completely new destination: http://burtin-website/fonts/FiraCode-LatinExt.woff2
- completely new destination: http://burtin-website/fonts/FiraCode-Latin.woff2
Added: http://burtin-website/css/code.min.4f0ccc8439f99bf7f7970298556b94011aabc1fcae743b6842fc3361a2da9ea3.css to Worker<0> with 97ms delay
Done checking: http://burtin-website/css/code.min.4f0ccc8439f99bf7f7970298556b94011aabc1fcae743b6842fc3361a2da9ea3.css (HTTP 200) => 0 links
Added: http://burtin-website/css/buttons.min.86f6b4c106b6c6eb690ae5203d36b442c1f66f718ff4e8164fa86cf6c61ad641.css to Worker<0> with 97ms delay
Done checking: http://burtin-website/css/buttons.min.86f6b4c106b6c6eb690ae5203d36b442c1f66f718ff4e8164fa86cf6c61ad641.css (HTTP 200) => 0 links
Added: http://burtin-website/favicon.png to Worker<0> with 97ms delay
Done checking: http://burtin-website/favicon.png (HTTP 200) => 0 links
Added: http://burtin-website/apple-touch-icon.png to Worker<0> with 98ms delay
Done checking: http://burtin-website/apple-touch-icon.png (HTTP 200) => 0 links
Added: http://burtin-website/index.xml to Worker<0> with 98ms delay
Done checking: http://burtin-website/index.xml (HTTP 200) => 0 links
Added: http://burtin-website/photos/boris-piano.jpg to Worker<0> with 98ms delay
Done checking: http://burtin-website/photos/boris-piano.jpg (HTTP 200) => 0 links
...

and the job completes successfully. Let me know if there's something else that I can do to diagnose the issue.