go/mirko: add SQL migrations machinery
This uses github.com/golang-migrate/migrate and adds a Source that
allows using go_embed data files.
We also provide a test/example.
Change-Id: Icd2b6c7f7d0f728073b3fdf39b432b33ce61a3cd
diff --git a/go/mirko/tests/sql/migrations/1564669976_two.up.sql b/go/mirko/tests/sql/migrations/1564669976_two.up.sql
new file mode 100644
index 0000000..b24d2fa
--- /dev/null
+++ b/go/mirko/tests/sql/migrations/1564669976_two.up.sql
@@ -0,0 +1 @@
+INSERT INTO users (username) VALUES ("q3k");