chore: add example for executor as key

.github/docs/monorepo/executor-as-key.js

@@ -0,0 +1,33 @@
+// /libs/lib1/project.json
+{
+  // ...
+  "test": {
+    "executor": "@nx/jest:jest",
+    "outputs": ["{workspaceRoot}/coverage/{projectRoot}"],
+    "options": {
+      "jestConfig": "libs/server/ai/jest.config.ts"
+    }
+  }
+  // ...
+}
+
+// nx.json
+{
+  // ...
+  "targetDefaults": {
+    "@nx/jest:jest": {
+      "cache": true,
+      "inputs": ["default", "^production", "{workspaceRoot}/jest.preset.cjs"],
+      "options": {
+        "passWithNoTests": true
+      },
+      "configurations": {
+        "ci": {
+          "ci": true,
+          "codeCoverage": true
+        }
+      }
+    }
+  }
+  // ...
+}