Implement case-insensitive matching for head branch name

__tests__/branch.test.ts

@@ -24,6 +24,34 @@ describe('getBranchName', () => {
       expect(result).toEqual('head-branch-name');
     });
   });
+
+  describe('Branch name matching', () => {
+    describe('when checking for case-insensitive match', () => {
+      // Test case 1: with mixed case in the branch name
+      beforeEach(() => {
+        github.context.payload.pull_request!.head = {
+          ref: 'feature-123-Refactor'
+        };
+      });
+
+      it('returns the head branch name in lowercase', () => {
+        const result = getBranchName('head');
+        expect(result).toEqual('feature-123-refactor');
+      });
+
+      // Test case 2: with uppercase in the branch name
+      beforeEach(() => {
+        github.context.payload.pull_request!.head = {
+          ref: 'feature-123-REFACTOR'
+        };
+      });
+
+      it('returns the head branch name in lowercase', () => {
+        const result = getBranchName('head');
+        expect(result).toEqual('feature-123-refactor');
+      });
+    });
+  });
 });
 
 describe('checkAllBranch', () => {

dist/index.js

@@ -531,7 +531,7 @@ function getBranchName(branchBase) {
         return (_a = pullRequest.base) === null || _a === void 0 ? void 0 : _a.ref;
     }
     else {
-        return (_b = pullRequest.head) === null || _b === void 0 ? void 0 : _b.ref;
+        return (_b = pullRequest.head) === null || _b === void 0 ? void 0 : _b.ref.toLowerCase();
     }
 }
 function checkAnyBranch(regexps, branchBase) {

src/branch.ts

@@ -36,7 +36,7 @@ export function getBranchName(branchBase: BranchBase): string | undefined {
   if (branchBase === 'base') {
     return pullRequest.base?.ref;
   } else {
-    return pullRequest.head?.ref;
+    return pullRequest.head?.ref.toLowerCase();
   }
 }