Fix github action for testing the PHP SDK (#40)

Author: amahadaya

.github/workflows/php-package.yml

@@ -14,10 +14,10 @@ jobs:
     steps:
       - uses: actions/checkout@v3
       - uses: actions/setup-node@v3
-      - name: Install Prism
-        run: (yarn global add @stoplight/prism-cli)
       - name: Start Prism Server
-        run: (prism mock -h 127.0.0.1 openapi.json &)
+        run: |
+          yarn install
+          ./node_modules/.bin/prism mock -h 127.0.0.1 openapi.json &
       - name: Validate composer.json and composer.lock
         run: composer validate
       - name: Cache Composer packages

package.json

@@ -0,0 +1,8 @@
+{
+  "dependencies": {
+    "@stoplight/prism-cli": "5.6.0"
+  },
+  "resolutions": {
+    "@stoplight/json": "3.20.0"
+  }
+}