authenticator storage engines

Created a storage interface used by authenticator to support multiple
types of storage types for private keys. Added a new file storage engine
which is now the default for web-api. Migrated aws secrets manager to be optional.

example-project/cmd/web-api/handlers/check.go

@@ -6,20 +6,31 @@ import (
 
 	"geeks-accelerator/oss/saas-starter-kit/example-project/internal/platform/web"
 	"github.com/jmoiron/sqlx"
+	"github.com/pkg/errors"
+	"gopkg.in/DataDog/dd-trace-go.v1/contrib/go-redis/redis"
 )
 
 // Check provides support for orchestration health checks.
 type Check struct {
 	MasterDB *sqlx.DB
+	Redis    *redis.Client
 
 	// ADD OTHER STATE LIKE THE LOGGER IF NEEDED.
 }
 
 // Health validates the service is healthy and ready to accept requests.
 func (c *Check) Health(ctx context.Context, w http.ResponseWriter, r *http.Request, params map[string]string) error {
+
+	// check postgres
 	_, err := c.MasterDB.Exec("SELECT 1")
 	if err != nil {
-		return err
+		return errors.Wrap(err, "Postgres failed")
+	}
+
+	// check redis
+	err = c.Redis.Ping().Err()
+	if err != nil {
+		return errors.Wrap(err, "Redis failed")
 	}
 
 	status := struct {