Link Checking with GitHub Actions not Working

Tooling
4

Ok when I switch to Julia 1.6 I got this more helpful error message:

curl: /opt/hostedtoolcache/julia/1.6.1/x64/bin/../lib/julia/libcurl.so.4: no version information available (required by curl)

Which relates to this stack exchange. When I run locate libcurl.so.4 on GitHub Actions using ubuntu-latest (after installing the documentation julia dependencies) I get:

/opt/hostedtoolcache/julia/1.6.1/x64/lib/julia/libcurl.so.4
/opt/hostedtoolcache/julia/1.6.1/x64/lib/julia/libcurl.so.4.7.0
/usr/lib/x86_64-linux-gnu/libcurl.so.4
/usr/lib/x86_64-linux-gnu/libcurl.so.4.6.0
/usr/local/julia1.6.1/lib/julia/libcurl.so.4
/usr/local/julia1.6.1/lib/julia/libcurl.so.4.7.0

Hence, Julia installed a version of libcurl that is different that the one already installed. Thus a workflow like this should fix the problem:

name: Documentation
on:
  push:
    branches: [master]
    tags: '*'
  pull_request:
    types: [opened, synchronize, reopened]
jobs:
  build:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v2
      - uses: julia-actions/setup-julia@latest
        with:
          version: '1.6' # Build documentation on Julia 1.6
      - name: Install julia dependencies
        run: julia --project=docs/ -e 'using Pkg; Pkg.develop(PackageSpec(path=pwd())); Pkg.instantiate()'
      - name: Fix curl mismatch # (https://stackoverflow.com/questions/30017397/error-curl-usr-local-lib-libcurl-so-4-no-version-information-available-requ)
        run: |
             julia_libcurl="$(dirname "$(which julia)")/../lib/julia/libcurl.so.4"
             sudo rm $julia_libcurl
             sudo ln -s /usr/lib/x86_64-linux-gnu/libcurl.so.4 $julia_libcurl
      - name: Build and deploy
        env:
          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }} # For authentication with GitHub Actions token
          DOCUMENTER_KEY: ${{ secrets.DOCUMENTER_KEY }} # For authentication with SSH deploy key
        run: julia --project=docs/ --color=yes docs/make.jl

When I run the above, I am able to linkcheck without issue.

To limit the amount of hardcoding needed, we can instead run:

sys_libcurl="$(find /usr/lib/x86_64-linux-gnu -maxdepth 1  -name "libcurl.so.*" | sort -n | tail -1)"
julia_lib="$(dirname "$(which julia)")/../lib/julia"
julia_libcurl="$(find $julia_lib -maxdepth 1 -name "libcurl.so.[0-9]" | sort -n | tail -1)"
sudo rm $julia_libcurl
sudo ln -s $sys_libcurl $julia_libcurl

This will search for the right libcurl.so.x versions instead of hard coding libcurl.so.4.

Someone with a better knowledge of the innerworkings could probably come up with a less hacky solution, but this is the best I could come up with.