Set GRAALVM_HOME for GraalVM distributions (#1146)

* Initial plan

* Set GRAALVM_HOME for GraalVM distributions

* Rebuild setup action bundle

---------

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>

Author: Copilot

__tests__/distributors/graalvm-installer.test.ts

@@ -166,6 +166,29 @@ describe('GraalVMDistribution', () => {
     });
   });
 
+  describe('setJavaDefault', () => {
+    it('should set GRAALVM_HOME for Oracle GraalVM', () => {
+      (distribution as any).setJavaDefault('17.0.5', '/cached/java/path');
+
+      expect(core.exportVariable).toHaveBeenCalledWith(
+        'GRAALVM_HOME',
+        '/cached/java/path'
+      );
+    });
+
+    it('should set GRAALVM_HOME for GraalVM Community', () => {
+      (communityDistribution as any).setJavaDefault(
+        '17.0.5',
+        '/cached/java/path'
+      );
+
+      expect(core.exportVariable).toHaveBeenCalledWith(
+        'GRAALVM_HOME',
+        '/cached/java/path'
+      );
+    });
+  });
+
   describe('downloadTool', () => {
     const javaRelease = {
       version: '17.0.5',

dist/setup/index.js

@@ -131328,6 +131328,10 @@ class GraalVMDistribution extends JavaBase {
             throw error;
         }
     }
+    setJavaDefault(version, toolPath) {
+        super.setJavaDefault(version, toolPath);
+        exportVariable('GRAALVM_HOME', toolPath);
+    }
     async findPackageForDownload(range) {
         this.validateVersionRange(range);
         const arch = this.getSupportedArchitecture();

src/distributions/graalvm/installer.ts

@@ -110,6 +110,11 @@ export class GraalVMDistribution extends JavaBase {
     }
   }
 
+  protected setJavaDefault(version: string, toolPath: string): void {
+    super.setJavaDefault(version, toolPath);
+    core.exportVariable('GRAALVM_HOME', toolPath);
+  }
+
   protected async findPackageForDownload(
     range: string
   ): Promise<JavaDownloadRelease> {