build: do not create metafiles when using reactive (#1151)

The reactive framework uses an incompatible variant that creates its own files.
The format defined by charmcraft cannot be used.

Fix: #1150

charmcraft/commands/build.py

@@ -176,9 +176,12 @@ def build_charm(self, bases_config: BasesConfiguration) -> str:
         with charmcraft.instrum.Timer("Lifecycle run"):
             lifecycle.run(Step.PRIME)
 
-        create_actions_yaml(lifecycle.prime_dir, self.config)
-        create_config_yaml(lifecycle.prime_dir, self.config)
-        create_metadata_yaml(lifecycle.prime_dir, self.config)
+        # skip creation yaml files if using reactive, reactive will create them
+        # in a incompatible way
+        if self._parts.get("charm", {}).get("plugin", None) != "reactive":
+            create_actions_yaml(lifecycle.prime_dir, self.config)
+            create_config_yaml(lifecycle.prime_dir, self.config)
+            create_metadata_yaml(lifecycle.prime_dir, self.config)
 
         # run linters and show the results
         linting_results = charmcraft.linters.analyze(self.config, lifecycle.prime_dir)