alembic: Update list of TLS methods available on ps_transports.

Related to #221 and #222.

Also adds `*.ini` to the `.gitignore` file in ast-db-manage for
convenience.

(cherry picked from commit 0dcf03e844)

contrib/ast-db-manage/.gitignore

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+*.ini

contrib/ast-db-manage/config/versions/37a5332640e2_update_pjsip_tls_method_list.py

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+"""update pjsip tls method list
+
+Revision ID: 37a5332640e2
+Revises: dac2b4c328b8
+Create Date: 2023-11-14 18:02:18.857452
+
+"""
+
+# revision identifiers, used by Alembic.
+revision = '37a5332640e2'
+down_revision = 'dac2b4c328b8'
+
+from alembic import op
+from sqlalchemy.dialects.postgresql import ENUM
+import sqlalchemy as sa
+
+PJSIP_TRANSPORT_METHOD_OLD_NAME = 'pjsip_transport_method_values'
+PJSIP_TRANSPORT_METHOD_NEW_NAME = 'pjsip_transport_method_values_v2'
+
+PJSIP_TRANSPORT_METHOD_OLD_VALUES = ['default', 'unspecified', 'tlsv1', 'sslv2',
+                                     'sslv3', 'sslv23']
+PJSIP_TRANSPORT_METHOD_NEW_VALUES = ['default', 'unspecified',
+                                     'tlsv1', 'tlsv1_1', 'tlsv1_2', 'tlsv1_3',
+                                     'sslv2', 'sslv23', 'sslv3']
+
+PJSIP_TRANSPORT_METHOD_OLD_TYPE = sa.Enum(*PJSIP_TRANSPORT_METHOD_OLD_VALUES,
+                                          name=PJSIP_TRANSPORT_METHOD_OLD_NAME)
+PJSIP_TRANSPORT_METHOD_NEW_TYPE = sa.Enum(*PJSIP_TRANSPORT_METHOD_NEW_VALUES,
+                                          name=PJSIP_TRANSPORT_METHOD_NEW_NAME)
+def upgrade():
+    if op.get_context().bind.dialect.name == 'postgresql':
+        enum = PJSIP_TRANSPORT_METHOD_NEW_TYPE
+        enum.create(op.get_bind(), checkfirst=False)
+
+    op.alter_column('ps_transports', 'method',
+                    type_=PJSIP_TRANSPORT_METHOD_NEW_TYPE,
+                    existing_type=PJSIP_TRANSPORT_METHOD_OLD_TYPE,
+                    postgresql_using='method::text::' + PJSIP_TRANSPORT_METHOD_NEW_NAME)
+
+    if op.get_context().bind.dialect.name == 'postgresql':
+        ENUM(name=PJSIP_TRANSPORT_METHOD_OLD_NAME).drop(op.get_bind(), checkfirst=False)
+
+def downgrade():
+    # First we need to ensure that columns are not using the enum values
+    # that are going away.
+    op.execute("UPDATE ps_transports SET method = 'tlsv1' WHERE method IN ('tlsv1_1', 'tlsv1_2', 'tlsv1_3')")
+
+    if op.get_context().bind.dialect.name == 'postgresql':
+        enum = PJSIP_TRANSPORT_METHOD_OLD_TYPE
+        enum.create(op.get_bind(), checkfirst=False)
+
+    op.alter_column('ps_transports', 'method',
+                    type_=PJSIP_TRANSPORT_METHOD_OLD_TYPE,
+                    existing_type=PJSIP_TRANSPORT_METHOD_NEW_TYPE,
+                    postgresql_using='method::text::' + PJSIP_TRANSPORT_METHOD_OLD_NAME)
+
+    if op.get_context().bind.dialect.name == 'postgresql':
+        ENUM(name=PJSIP_TRANSPORT_METHOD_NEW_NAME).drop(op.get_bind(), checkfirst=False)