Move to yaml-based configuration

This commit updates the configuration to be yaml-based and updates the
configuration to read in a yaml file.

internal/config/database.go

@@ -0,0 +1,23 @@
+package config
+
+type DatabaseConfig struct {
+	// Credentials for the admin user.
+	// Is automatically created if it does not exist.
+	AdminUsername string `yaml:"username" default:"admin" validate:"nonempty"`
+	AdminPassword string `yaml:"password" validate:"nonempty"`
+
+	// Prefix for new users and data setss
+	UserPrefix string `yaml:"user_prefix" default:"wisski-distillery-" validate:"slug"`
+	DataPrefix string `yaml:"fragment_prefix" default:"wisski-distillery-" validate:"slug"`
+}
+
+type SQLConfig struct {
+	DatabaseConfig `yaml:",inline" recurse:"true"`
+
+	// Database to use to store distillery datastructures
+	Database string `yaml:"database" default:"distillery" validate:"slug"`
+}
+
+type TSConfig struct {
+	DatabaseConfig `yaml:",inline" recurse:"true"`
+}