GitHub Action to install juliaup.

When you use this action, it will do three things:

1. Make sure that juliaup is available (downloading if if necessary).
2. Use juliaup to install the specified version of Julia.
3. Add both juliaup and julia to the PATH.

To install the latest stable Julia v1:

- uses: julia-actions/install-juliaup@v1
  with:
    julia-version: '1'

# Your selected Julia version is now available in the PATH:
- run: julia --version

To install a specific Julia version:

- uses: julia-actions/install-juliaup@v1
  with:
    julia-version: '1.10.2'

In general, if juliaup add FOO would have been a valid command on your local machine, then FOO is a valid value for the julia-version input to this action.

So, for example, suppose that you want alpha pre-releases for the next upcoming release. On your local machine, juliaup add alpha is a valid command. Therefore, alpha is a valid value for the julia-version input to this action:

- uses: julia-actions/install-juliaup@v1
  with:
    julia-version: 'alpha'

See the Juliaup README for more examples.

For example, suppose that your GitHub Actions workflow file includes a job matrix as such:

strategy:
  matrix:
    julia-version:
      - 'lts'
      - '1.10'
      - '1'
      - 'nightly'

Then install-juliaup can use this job matrix as follows:

- uses: julia-actions/install-juliaup@v1
  with:
    julia-version: ${{ matrix.julia-version }}

When the install-juliaup action runs, it adds juliaup to the PATH. Therefore, in subsequent steps, you can directly run juliaup commands if you want:

- uses: julia-actions/install-juliaup@v1
  with:
    julia-version: '1'

- run: juliaup status
- run: juliaup add 1.10
- run: juliaup update 1.10
- run: juliaup default 1.10
- run: juliaup status

We highly recommend that you set up Dependabot version updates on your repo to keep your GitHub Actions up to date.

To set up Dependabot version updates, create a file named .github/dependabot.yml in your repo with the following contents:

version: 2
updates:
  - package-ecosystem: "github-actions"
    directory: "/"
    schedule:
      interval: "monthly"
    open-pull-requests-limit: 99
    labels:
      - "dependencies"
      - "github-actions"

For more details on Dependabot version updates, see the GitHub Dependabot documentation.

The internal-juliaup-version input is a private internal and is not part of the public API of this action. Therefore, in a future non-breaking (minor or patch) release of this action, we are allowed to:

1. Rename the input.
2. Remove the input altogether.
3. Change the default value of the input.
4. Make any other changes to the behavior of the input.