ci: add alembic check

Author: guan404ming

.github/actions/migration_tests/action.yml

@@ -32,11 +32,13 @@ runs:
         DB_RESET: "false"
         AIRFLOW_2_CMD: >-
           airflow db reset --skip-init -y &&
-          airflow db migrate --to-revision heads
+          airflow db migrate --to-revision heads &&
+          cd airflow-core/src/airflow && alembic check
         AIRFLOW_3_CMD: >-
           airflow db migrate --to-revision heads &&
           airflow db downgrade -n 2.7.0 -y &&
-          airflow db migrate
+          airflow db migrate &&
+          cd airflow-core/src/airflow && alembic check
       if: env.BACKEND != 'sqlite'
     - name: "Bring composer down"
       shell: bash
@@ -57,7 +59,8 @@ runs:
         AIRFLOW_3_CMD: >-
           airflow db migrate --to-revision heads &&
           airflow db downgrade -n 2.7.0 -y &&
-          airflow db migrate
+          airflow db migrate &&
+          cd airflow-core/src/airflow && alembic check
       if: env.BACKEND != 'sqlite'
     - name: "Bring compose down again"
       shell: bash
@@ -70,7 +73,8 @@ runs:
         breeze shell "airflow db reset -y &&
         airflow db migrate --to-revision heads &&
         airflow db downgrade -n 2.7.0 -y &&
-        airflow db migrate"
+        airflow db migrate &&
+        cd airflow-core/src/airflow && alembic check"
       env:
         COMPOSE_PROJECT_NAME: "docker-compose"
         AIRFLOW__DATABASE__EXTERNAL_DB_MANAGERS: "airflow.providers.fab.auth_manager.models.db.FABDBManager"

airflow-core/src/airflow/models/dag.py

@@ -2170,7 +2170,7 @@ class DagModel(Base):
     # Note: Do not depend on fileloc pointing to a file; in the case of a
     # packaged DAG, it will point to the subpath of the DAG within the
     # associated zip.
-    fileloc = Column(String(2000))
+    # fileloc = Column(String(2000))
     relative_fileloc = Column(String(2000))
     bundle_name = Column(StringID(), ForeignKey("dag_bundle.name"), nullable=True)
     # The version of the bundle the last time the DAG was processed