GitHub Actions: Add codespell problem matcher

.github/workflows/ci.yaml

@@ -195,6 +195,9 @@ jobs:
         run: |
           echo "Failed to restore Python virtual environment from cache"
           exit 1
+      - name: Register codespell problem matcher
+        run: |
+          echo "::add-matcher::.github/workflows/matchers/codespell.json"
       - name: Run codespell
         run: |
           . venv/bin/activate

.github/workflows/matchers/codespell.json

@@ -0,0 +1,16 @@
+{
+  "problemMatcher": [
+    {
+      "owner": "codespell",
+      "severity": "warning",
+      "pattern": [
+        {
+          "regexp": "^(.+):(\\d+):\\s(.+)$",
+          "file": 1,
+          "line": 2,
+          "message": 3
+        }
+      ]
+    }
+  ]
+}