Add Julia Registry

If your package depends on private packages registered in a private registry, you need to handle authentication to that registry and the package repositories in a fully automated way, since you can't manually enter credentials in a CI environment. This action will deal with all of that for you, all you need is an SSH private key.

jobs:
  test:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4
      - uses: julia-actions/setup-julia@v2
        with:
          version: 1
      - uses: julia-actions/cache@v1
      - uses: julia-actions/add-julia-registry@v2
        with:
          key: ${{ secrets.SSH_KEY }}
          registry: MyOrg/MyRegistry
      - uses: julia-actions/julia-runtest@v1

This action does the following:

• Starts ssh-agent
• Adds your private key to the agent
• Configures Git to rewrite HTTPS URLs (https://github.com/foo/bar) to SSH URLs (git@github.com:foo/bar)
• Downloads the registry you specify and General

Therefore, when Pkg tries to download packages from the HTTPS URLs in the registry, it will do so over SSH, using your private key as authentication.