ci: use actionlint and problem matchers (#4116)

.github/matchers/copr-ci.json

@@ -0,0 +1,17 @@
+{
+  "problemMatcher": [
+    {
+      "owner": "copr-ci-gcc",
+      "pattern": [
+        {
+          "regexp": "^/?(?:[^/]+/){5}([^:]+):(\\d+):(\\d+):\\s+(?:fatal\\s+)?(warning|error):\\s+(.*)$",
+          "file": 1,
+          "line": 2,
+          "column": 3,
+          "severity": 4,
+          "message": 5
+        }
+      ]
+    }
+  ]
+}