Add missing migration for OIDCPublisherProjectAssociation constraint (#18381)

Author: di

warehouse/migrations/versions/30c837b1425a_add_oidcpublisherprojectassociation_.py

@@ -0,0 +1,23 @@
+# SPDX-License-Identifier: Apache-2.0
+"""
+Add OIDCPublisherProjectAssociation constraint
+
+Revision ID: 30c837b1425a
+Revises: 082def83d89f
+Create Date: 2025-07-17 17:53:57.897999
+"""
+
+from alembic import op
+
+revision = "30c837b1425a"
+down_revision = "082def83d89f"
+
+
+def upgrade():
+    op.create_unique_constraint(
+        None, "oidc_publisher_project_association", ["oidc_publisher_id", "project_id"]
+    )
+
+
+def downgrade():
+    op.drop_constraint(None, "oidc_publisher_project_association", type_="unique")