Replace go-migrate with morph (#19116)

db/migrations/postgres/000033_create_sidebar_channels.up.sql

@@ -0,0 +1,24 @@
+CREATE TABLE IF NOT EXISTS sidebarchannels (
+    channelid VARCHAR(26),
+    userid VARCHAR(26),
+    categoryid VARCHAR(26),
+    sortorder bigint,
+    PRIMARY KEY (channelid, userid, categoryid)
+);
+
+DO $$
+<<modify_column_type_if_type_is_different>>
+DECLARE
+    col_exist_and_type_different boolean := false;
+BEGIN
+    SELECT count(*) != 0 INTO col_exist_and_type_different
+    FROM information_schema.columns
+    WHERE table_name = 'sidebarchannels'
+    AND column_name = 'categoryid'
+    AND data_type = 'character varying'
+    AND NOT character_maximum_length = 128;
+
+    IF col_exist_and_type_different THEN
+        ALTER TABLE sidebarchannels ALTER COLUMN categoryid TYPE varchar(128);
+    END IF;
+END modify_column_type_if_type_is_different $$