lifecycle: add migration to 0.12 which removes old outpost state from cache

lifecycle/system_migrations/to_0_12.py

@@ -0,0 +1,28 @@
+from pickle import loads  # nosec
+
+from redis import Redis
+
+from lifecycle.migrate import BaseMigration
+from passbook.lib.config import CONFIG
+
+
+class To012Migration(BaseMigration):
+    def __init__(self) -> None:
+        self.redis = Redis(
+            host=CONFIG.y("redis.host"),
+            port=6379,
+            db=CONFIG.y("redis.cache_db"),
+            password=CONFIG.y("redis.password"),
+        )
+
+    def needs_migration(self) -> bool:
+        keys = self.redis.keys(":1:outpost_*")
+        for key in keys:
+            value = loads(self.redis.get(key))  # nosec
+            if isinstance(value, str):
+                return True
+        return False
+
+    def run(self):
+        keys_to_delete = self.redis.keys(":1:outpost_*")
+        self.redis.delete(*keys_to_delete)