chore: toggle --experimental-json-modules flag usage

.env

@@ -17,12 +17,16 @@ if [ -f "./node_modules/ts-node/esm.mjs" ]; then
   # Silence warnings
   NODE_NO_WARNINGS=1
 
+  # Import JSON modules
+  JSON_MODULES=''
+  [ !$GITHUB_ACTIONS ] && JSON_MODULES='--experimental-json-modules'
+
   # Don't require imported modules to include extensions
   SPECIFIER_RESOLUTION='--es-module-specifier-resolution node'
 
   # Use custom ESM loader
   LOADER='--loader ./tools/loaders/esm.js'
 
   # Specify Node options
-  NODE_OPTIONS="$SPECIFIER_RESOLUTION $LOADER"
+  NODE_OPTIONS="$JSON_MODULES $SPECIFIER_RESOLUTION $LOADER"
 fi