scripts: forge-migrate.sh — run pending DB migrations + restart

for the 'table X has no column Y' class of schema-lag errors that
showed up generating an access token on a fresh 11.0.13 install.

scripts/forge-migrate.sh

@@ -0,0 +1,12 @@
+#!/usr/bin/env bash
+# Run pending Forgejo DB migrations + restart the daemon.
+#
+# Use after upgrading the forgejo package, or when a CLI command
+# errors with "table X has no column named Y" (schema lag).
+set -euo pipefail
+
+sudo nixos-container run hive-forge -- runuser -u forgejo -- \
+  forgejo --work-path /var/lib/forgejo migrate
+
+sudo nixos-container run hive-forge -- systemctl restart forgejo
+echo "forge: migrated + restarted"