Add custom repository option

README.md

@@ -3,6 +3,16 @@
 Set up the [Spack package manager](https://github.com/spack/spack) with a default build cache to
 speed up your actions.
 
+## Options
+
+| Name        | Description                          | Default        |
+|-------------|--------------------------------------|----------------|
+| `ref`       | Version of Spack                     | `"develop"`    |
+| `buildcache`| Enable the GitHub Action build cache | `true`         |
+| `color`     | Force color output                   | `true`         |
+| `path`      | Path to install Spack to             | `"spack"`      |
+| `repository`| GitHub repository for Spack          | `"spack/spack"`|
+
 ## Example: basic setup
 
 ```yaml
@@ -82,10 +92,10 @@ jobs:
     steps:
     - name: Checkout
       uses: actions/checkout@v4
-    
+
     - name: Set up Spack
       uses: spack/setup-spack@v2
-    
+
     - name: Install
       run: spack -e . install
 

action.yml

@@ -21,13 +21,17 @@ inputs:
     description: "Path to install Spack to"
     required: false
     default: "spack"
+  repository:
+    description: "GitHub repository where Spack or its fork lives"
+    required: false
+    default: "spack/spack"
 runs:
   using: "composite"
   steps:
   - name: Checkout Spack
     uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683
     with:
-      repository: spack/spack
+      repository: ${{ inputs.repository }}
       path: ${{ inputs.path }}
       ref: ${{ inputs.ref }}