Add error and warning matchers

.github/elixir.json

@@ -11,6 +11,21 @@
           "message": 7
         }
       ]
+    },
+    {
+      "owner": "elixir-warning",
+      "pattern": [
+        {
+          "regexp": "^(warning: (.*))$",
+          "message": 2
+        },
+        {
+          "regexp": "^(  )((.:)?[^:]*):(\\d+)(:(\\d+))?$",
+          "file": 2,
+          "line": 4,
+          "column": 6
+        }
+      ]
     }
   ]
 }

src/setup-elixir.js

@@ -38,6 +38,9 @@ async function main() {
 
   if (installRebar) await exec('mix local.rebar --force')
   if (installHex) await exec('mix local.hex --force')
+
+  const matchersPath = path.join(__dirname, '..', '.github');
+  console.log(`##[add-matcher]${path.join(matchersPath, 'elixir.json')}`);
 }
 
 function checkPlatform() {