ci: install darwin directly for a failure

Author: KazuCocoa

.github/workflows/functional-test.yml

@@ -88,8 +88,8 @@ jobs:
     - run: npm install -g appium
     - run: |
         appium plugin install images
-        # for macOS env specific
-        npm install -g --os=darwin --cpu=arm64 sharp
+        # Install sharp in the images plugin's directory. This is a workaround
+        cd ~/.appium/node_modules/@appium/images-plugin && npm install --no-package-lock --cpu=arm64 --os=darwin sharp
         appium plugin install execute-driver
         # Workaround to keep symlink to global appium
         appium driver install xcuitest
@@ -167,8 +167,6 @@ jobs:
         npm install -g mjpeg-consumer
     - run: |
         appium plugin install images
-        # for macOS env specific
-        npm install -g --os=darwin --cpu=arm64 sharp
         appium plugin install execute-driver
         # Workaround to keep symlink to global appium
         appium driver install xcuitest