Add PHPUnit problem matcher

src/install.ts

@@ -4,6 +4,7 @@ import * as config from './config';
 import * as coverage from './coverage';
 import * as extensions from './extensions';
 import * as utils from './utils';
+import {addMatchers} from './matchers';
 
 /**
  * Build the script
@@ -63,6 +64,8 @@ export async function run(): Promise<void> {
         );
         break;
     }
+
+    addMatchers();
   } catch (error) {
     core.setFailed(error.message);
   }

src/matchers.ts

@@ -0,0 +1,10 @@
+import * as path from 'path';
+
+/**
+ * Add matches using the Actions Toolkit problem matchers syntax
+ * https://github.com/actions/toolkit/blob/master/docs/problem-matchers.md
+ */
+export function addMatchers(): void {
+  const matchersPath = path.join(__dirname, '..', '.github/matchers');
+  console.log(`##[add-matcher]${path.join(matchersPath, 'phpunit.json')}`);
+}