ComposeContainer.exec: Rewrite to execute command directly

podman-compose-backup.py

@@ -311,13 +311,14 @@ class ComposeContainer:
     def depends_on(self) -> Sequence[ComposeContainer]:
         return [self.compose.services[name] for name in self.base.get("depends_on", [])]
 
-    def exec_cmd(
+    def exec(
         self,
         command: CommandArgs,
+        check: bool = True,
         workdir: Optional[str] = None,
-    ) -> CommandArgs:
-        return combine_cmds(
-            PODMAN_EXEC,
+    ) -> CompletedProcess:
+        return self.compose.podman.exec_podman(
+            command=combine_cmds(
                 [
                     "container",
                     "exec",
@@ -326,6 +327,8 @@ class ComposeContainer:
                     self.container_name,
                 ],
                 command,
+            ),
+            check=check,
         )