Add PostCSS configuration and skills lock file

- Created a new PostCSS configuration file to integrate Tailwind CSS.
- Added a skills lock file containing various Expo skills with their respective source and computed hashes.

.agents/skills/expo-cicd-workflows/scripts/package.json

@@ -0,0 +1,11 @@
+{
+  "name": "@expo/cicd-workflows-skill",
+  "version": "0.0.0",
+  "private": true,
+  "type": "module",
+  "dependencies": {
+    "ajv": "^8.17.1",
+    "ajv-formats": "^3.0.1",
+    "js-yaml": "^4.1.0"
+  }
+}