Add a GitHub workflow to comment the SQL generated by a migration in PRs

[jonathan-d-zhang]

No description provided.

[github-actions]

alembic upgrade --sql ...

INFO  [alembic.runtime.migration] Context impl PostgresqlImpl.
INFO  [alembic.runtime.migration] Generating static SQL
INFO  [alembic.runtime.migration] Will assume transactional DDL.
INFO  [alembic.runtime.migration] Running upgrade 6991bcb18f89 -> d80b98a7f9d2, test revision
BEGIN;

-- Running upgrade 6991bcb18f89 -> d80b98a7f9d2

DROP TABLE scans;

UPDATE alembic_version SET version_num='d80b98a7f9d2' WHERE alembic_version.version_num = '6991bcb18f89';

COMMIT;

[github-actions]

alembic upgrade --sql $prev_head:head

INFO  [alembic.runtime.migration] Context impl PostgresqlImpl.
INFO  [alembic.runtime.migration] Generating static SQL
INFO  [alembic.runtime.migration] Will assume transactional DDL.
INFO  [alembic.runtime.migration] Running upgrade 6991bcb18f89 -> b34ca8f2c587, test-revision
BEGIN;

-- Running upgrade 6991bcb18f89 -> b34ca8f2c587

DROP TABLE scans;

UPDATE alembic_version SET version_num='b34ca8f2c587' WHERE alembic_version.version_num = '6991bcb18f89';

COMMIT;

alembic downgrade --sql head:$prev_head

INFO  [alembic.runtime.migration] Context impl PostgresqlImpl.
INFO  [alembic.runtime.migration] Generating static SQL
INFO  [alembic.runtime.migration] Will assume transactional DDL.
INFO  [alembic.runtime.migration] Running downgrade b34ca8f2c587 -> 6991bcb18f89, test-revision
BEGIN;

-- Running downgrade b34ca8f2c587 -> 6991bcb18f89

UPDATE alembic_version SET version_num='6991bcb18f89' WHERE alembic_version.version_num = 'b34ca8f2c587';

COMMIT;

[github-actions]

alembic upgrade --sql $prev_head:head

INFO  [alembic.runtime.migration] Context impl PostgresqlImpl.
INFO  [alembic.runtime.migration] Generating static SQL
INFO  [alembic.runtime.migration] Will assume transactional DDL.
INFO  [alembic.runtime.migration] Running upgrade 6991bcb18f89 -> 2f5a9d8f24d8, test-revision
BEGIN;

-- Running upgrade 6991bcb18f89 -> 2f5a9d8f24d8

UPDATE alembic_version SET version_num='2f5a9d8f24d8' WHERE alembic_version.version_num = '6991bcb18f89';

COMMIT;

alembic downgrade --sql head:$prev_head

INFO  [alembic.runtime.migration] Context impl PostgresqlImpl.
INFO  [alembic.runtime.migration] Generating static SQL
INFO  [alembic.runtime.migration] Will assume transactional DDL.
INFO  [alembic.runtime.migration] Running downgrade 2f5a9d8f24d8 -> 6991bcb18f89, test-revision
BEGIN;

-- Running downgrade 2f5a9d8f24d8 -> 6991bcb18f89

UPDATE alembic_version SET version_num='6991bcb18f89' WHERE alembic_version.version_num = '2f5a9d8f24d8';

COMMIT;