Add VM automirror support

Allows shipping snapshots automatically to remote clusters on a cron,
identically to how autobackup handles local snapshot exports.

VMs are selected based on configured tags, and individual destination
clusters can be specified based on a colon-separated suffix to the
tag(s).

Automirror snapshots use the prefix "am" (analogous to "ab" for
autobackups) to differentiate them from normal "mr" mirrors.

worker-daemon/pvcworkerd/Daemon.py

@@ -53,6 +53,9 @@ from daemon_lib.vmbuilder import (
 from daemon_lib.autobackup import (
     worker_cluster_autobackup,
 )
+from daemon_lib.automirror import (
+    worker_cluster_automirror,
+)
 
 # Daemon version
 version = "0.9.103"
@@ -122,6 +125,26 @@ def cluster_autobackup(self, force_full=False, email_recipients=None, run_on="pr
     )
 
 
+@celery.task(name="cluster.automirror", bind=True, routing_key="run_on")
+def cluster_automirror(
+    self, email_recipients=None, email_errors_only=False, run_on="primary"
+):
+    @ZKConnection(config)
+    def run_cluster_automirror(
+        zkhandler, self, email_recipients=None, email_errors_only=False
+    ):
+        return worker_cluster_automirror(
+            zkhandler,
+            self,
+            email_recipients=email_recipients,
+            email_errors_only=email_errors_only,
+        )
+
+    return run_cluster_automirror(
+        self, email_recipients=email_recipients, email_errors_only=email_errors_only
+    )
+
+
 @celery.task(name="vm.flush_locks", bind=True, routing_key="run_on")
 def vm_flush_locks(self, domain=None, force_unlock=False, run_on="primary"):
     @ZKConnection(config)