Ignore undeploying builds when counting deployed

Otherwise the undeployer evicts too many builds
as it loops until the first builds are actually deleted.

src/runboat/controller.py

@@ -85,7 +85,7 @@ class Controller:
 
     @property
     def deployed(self) -> int:
-        return self.db.count_all()
+        return self.db.count_deployed()
 
     @property
     def max_deployed(self) -> int:

src/runboat/db.py

@@ -170,6 +170,13 @@ class BuildsDb:
         count = self._con.execute("SELECT COUNT(name) FROM builds").fetchone()[0]
         return cast(int, count)
 
+    def count_deployed(self) -> int:
+        count = self._con.execute(
+            "SELECT COUNT(name) FROM builds WHERE status!=?",
+            (BuildStatus.undeploying,),
+        ).fetchone()[0]
+        return cast(int, count)
+
     def to_cleanup(self) -> list[Build]:
         rows = self._con.execute(
             "SELECT * FROM builds WHERE status=? ORDER BY created",