feat: support array-form Go versions in mise.toml

__tests__/setup-go.test.ts

@@ -1019,6 +1019,20 @@ go = "1.24"
       expect(logSpy).toHaveBeenCalledWith('matching 1.25...');
     });
 
+    it('reads the first version from an array in mise.toml', async () => {
+      inputs['go-version-file'] = 'mise.toml';
+      existsSpy.mockImplementation(() => true);
+      readFileSpy.mockImplementation(() =>
+        Buffer.from('[tools]\ngo = ["1.26", "1.27"]\n')
+      );
+
+      await main.run();
+
+      expect(logSpy).toHaveBeenCalledWith('Setup go version spec 1.26');
+      expect(logSpy).toHaveBeenCalledWith('Attempting to download 1.26...');
+      expect(logSpy).toHaveBeenCalledWith('matching 1.26...');
+    });
+
     it('reads version from .go-version', async () => {
       inputs['go-version-file'] = '.go-version';
       existsSpy.mockImplementation(() => true);

dist/setup/index.js

@@ -45024,16 +45024,15 @@ function parseGoVersionFile(versionFilePath) {
         return match ? match[1].trim() : '';
     }
     else if (external_path_.basename(versionFilePath) === 'mise.toml') {
-        // mise stores tool versions under the [tools] table. The Go tool is
-        // named "go" in mise, even though this action uses "golang" elsewhere.
         try {
             const manifest = parse(contents);
             const go = manifest?.tools?.go;
-            if (typeof go === 'object' && go?.version) {
+            const first = Array.isArray(go) ? go[0] : go;
-                return go.version;
+            if (typeof first === 'object' && typeof first?.version === 'string') {
+                return first.version;
             }
-            if (typeof go === 'string') {
+            if (typeof first === 'string') {
-                return go;
+                return first;
             }
             return '';
         }

src/installer.ts

@@ -673,12 +673,14 @@ export function parseGoVersionFile(versionFilePath: string): string {
       const manifest: Record<string, any> = parse(contents);
       const go = manifest?.tools?.go;
 
-      if (typeof go === 'object' && go?.version) {
+      const first = Array.isArray(go) ? go[0] : go;
-        return go.version;
+
+      if (typeof first === 'object' && typeof first?.version === 'string') {
+        return first.version;
       }
 
-      if (typeof go === 'string') {
+      if (typeof first === 'string') {
-        return go;
+        return first;
       }
 
       return '';