Expose machine ID (#5953)

Expose the unique machine ID of the local system via the Supervisor
API. This allows to identify a particular machine across reboots,
backup restores and updates. The machine ID is a stable identifier
that does not change unless the underlying hardware is changed or
the operating system is reinstalled.

supervisor/api/root.py

@@ -17,6 +17,7 @@ from ..const import (
     ATTR_ICON,
     ATTR_LOGGING,
     ATTR_MACHINE,
+    ATTR_MACHINE_ID,
     ATTR_NAME,
     ATTR_OPERATING_SYSTEM,
     ATTR_STATE,
@@ -48,6 +49,7 @@ class APIRoot(CoreSysAttributes):
             ATTR_OPERATING_SYSTEM: self.sys_host.info.operating_system,
             ATTR_FEATURES: self.sys_host.features,
             ATTR_MACHINE: self.sys_machine,
+            ATTR_MACHINE_ID: self.sys_machine_id,
             ATTR_ARCH: self.sys_arch.default,
             ATTR_STATE: self.sys_core.state,
             ATTR_SUPPORTED_ARCH: self.sys_arch.supported,

supervisor/const.py

@@ -246,6 +246,7 @@ ATTR_LOGO = "logo"
 ATTR_LONG_DESCRIPTION = "long_description"
 ATTR_MAC = "mac"
 ATTR_MACHINE = "machine"
+ATTR_MACHINE_ID = "machine_id"
 ATTR_MAINTAINER = "maintainer"
 ATTR_MAP = "map"
 ATTR_MEMORY_LIMIT = "memory_limit"

supervisor/coresys.py

@@ -673,7 +673,7 @@ class CoreSysAttributes:
 
     @property
     def sys_machine_id(self) -> str | None:
-        """Return machine id."""
+        """Return machine ID."""
         return self.coresys.machine_id
 
     @property