Build local product stack with Vault-managed secrets (#42)

dev/vault/agent.hcl

@@ -0,0 +1,14 @@
+vault { address = "http://vault:8200" }
+auto_auth {
+  method "approle" {
+    config = {
+      role_id_file_path = "/etc/agent/role-id"
+      secret_id_file_path = "/etc/agent/secret-id"
+      remove_secret_id_file_after_reading = false
+    }
+  }
+}
+template_config {
+  static_secret_render_interval = "10s"
+  exit_on_retry_failure = true
+}