test: Use a template to prevent migrations from running for every test (#2462)

* test: Use a template to prevent migrations from running for every test

* Create a single makefile target

* Fix built-in race

* Extend timeout of built-in PostgreSQL fetch

scripts/migrate-ci/main.go

@@ -0,0 +1,36 @@
+package main
+
+import (
+	"database/sql"
+	"fmt"
+
+	"github.com/coder/coder/coderd/database"
+	"github.com/coder/coder/cryptorand"
+)
+
+func main() {
+	dbURL := "postgres://postgres:postgres@127.0.0.1:5432/postgres?sslmode=disable"
+	db, err := sql.Open("postgres", dbURL)
+	if err != nil {
+		panic(err)
+	}
+	defer db.Close()
+
+	dbName, err := cryptorand.StringCharset(cryptorand.Lower, 10)
+	if err != nil {
+		panic(err)
+	}
+
+	dbName = "ci" + dbName
+	_, err = db.Exec("CREATE DATABASE " + dbName)
+	if err != nil {
+		panic(err)
+	}
+
+	err = database.MigrateUp(db)
+	if err != nil {
+		panic(err)
+	}
+
+	_, _ = fmt.Println(dbName)
+}