Add prefix input (#24)

This allows inserting commands like xvfb-run in front of the Julia command

(fixes #3)

Co-authored-by: Isaac Good <github@isaacgood.com>

README.md

@@ -33,3 +33,36 @@ jobs:
       - uses: julia-actions/julia-buildpkg@latest
       - uses: julia-actions/julia-runtest@latest
 ```
+
+### Prefixing the Julia command
+
+In some packages, you may want to prefix the `julia` command with another command, e.g. for running tests of certain graphical libraries with `xvfb-run`.
+In that case, you can add an input called `prefix` containing the command that will be inserted to your workflow:
+
+```yaml
+      - uses: julia-actions/julia-runtest@v1
+        with:
+          prefix: xvfb-run
+```
+
+If you only want to add this prefix on certain builds, you can [include additional values into a combination](https://docs.github.com/en/free-pro-team@latest/actions/reference/workflow-syntax-for-github-actions#example-including-additional-values-into-combinations) of your build matrix, e.g.:
+
+```yaml
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [ubuntu-latest, windows-latest, macOS-latest]
+        version: ['1.0', '1', 'nightly']
+        arch: [x64]
+        include:
+          - os: ubuntu-latest
+            prefix: xvfb-run
+    steps:
+    # ...
+      - uses: julia-actions/julia-runtest@v1
+        with:
+          prefix: ${{ matrix.prefix }}
+    # ...
+```
+
+This will add the prefix `xvfb-run` to all builds where the `os` is `ubuntu-latest`.

action.yml

@@ -19,6 +19,10 @@ inputs:
   project:
     description: 'Value passed to the --project flag. The default value is the repository root: "@."'
     default: '@.'
+  prefix:
+    description: 'Value inserted in front of the julia command, e.g. for running xvfb-run julia [...]'
+    default: ''
+    required: false
 
 runs:
   using: 'composite'
@@ -39,5 +43,14 @@ runs:
         # the request metadata to pkg.julialang.org when installing
         # packages via `Pkg.test`.
         JULIA_PKG_SERVER: ""
-    - run: julia --color=yes --check-bounds=yes --inline=${{ inputs.inline }} --depwarn=${{ inputs.depwarn }} --project=${{ inputs.project }} -e 'using Pkg; Pkg.test(coverage=${{ inputs.coverage }})'
+    - run: |
+        # The Julia command that will be executed
+        julia_cmd=( julia --color=yes --check-bounds=yes --inline=${{ inputs.inline }} --depwarn=${{ inputs.depwarn }} --project=${{ inputs.project }} -e 'using Pkg; Pkg.test(coverage=${{ inputs.coverage }})' )
+
+        # Add the prefix in front of the command if there is one
+        prefix="${{ inputs.prefix }}"
+        [[ -n $prefix ]] && julia_cmd=( "$prefix" "${julia_cmd[@]}" )
+
+        # Run the Julia command
+        "${julia_cmd[@]}"
       shell: bash