Added rudimentary release search.

migrations/20200225223307_search.js

@@ -0,0 +1,14 @@
+exports.up = knex => Promise.resolve()
+    .then(() => knex.raw(`
+        CREATE FUNCTION search_releases(search text) RETURNS SETOF releases AS $$
+                SELECT * FROM releases
+                WHERE
+                title ILIKE ('%' || search || '%') OR
+                url ILIKE ('%' || search || '%')
+        $$ LANGUAGE SQL STABLE;
+    `));
+
+exports.down = knex => Promise.resolve()
+    .then(() => knex.raw(`
+        DROP FUNCTION IF EXISTS search_releases;
+    `));