Use GITHUB_ACTION_REPOSITORY for default Docker image name

GITHUB_REPOSITORY points to the caller's repository, not the action's own repository. Switch to GITHUB_ACTION_REPOSITORY so the default image correctly resolves to the action's GHCR package.

Author: dash14

setup/action.yml

@@ -3,7 +3,7 @@ description: Start buildcage builder container
 
 inputs:
   buildcage_image:
-    description: "Docker image name (default: ghcr.io/<owner>/<repo>)"
+    description: "Docker image name (default: ghcr.io/<action-owner>/<action-repo>)"
     required: false
   buildcage_version:
     description: "Image tag"

setup/main.mjs

@@ -40,7 +40,7 @@ function resolveVersion(image) {
 }
 
 const buildcageImage = (process.env.INPUT_BUILDCAGE_IMAGE
-  || `ghcr.io/${process.env.GITHUB_REPOSITORY}`).toLowerCase();
+  || `ghcr.io/${process.env.GITHUB_ACTION_REPOSITORY}`).toLowerCase();
 const buildcageVersion = resolveVersion(buildcageImage);
 
 console.log(`buildcage image: ${buildcageImage}:${buildcageVersion}`);