fix: use dot instead of source for shell compatibility

- Replace 'source' with '.' in npm scripts for better compatibility with /bin/sh
- Fixes GitHub Actions build error

package.json

@@ -21,11 +21,11 @@
     "ios:device": "react-native run-ios --device",
     "ios:iphone14": "react-native run-ios --simulator='iPhone 14'",
     "android:clean-run": "cd android && ./gradlew clean && cd .. && react-native run-android",
-    "android:release": "source .env && cd android && ./gradlew assembleRelease && cd ..",
+    "android:release": ". .env && cd android && ./gradlew assembleRelease && cd ..",
     "android:bundle": "cd android && ./gradlew bundleRelease && cd ..",
     "android:create-keystore": "./scripts/create-keystore.sh",
     "android:encode-keystore": "./scripts/encode-keystore.sh",
-    "android:build-release": "npm run clean:android && source .env && cd android && ./gradlew assembleRelease bundleRelease && cd .."
+    "android:build-release": "npm run clean:android && . .env && cd android && ./gradlew assembleRelease bundleRelease && cd .."
   },
   "dependencies": {
     "@react-native-community/datetimepicker": "^8.2.0",