feature: basic management service implementation (#44)

* feat: basic management service implementation [FAILING TESTS]

* test: fix healthcheck test

* test: #39 add peer registration endpoint test

* feat: #39 add setup key handling

* feat: #39 add peer management store persistence

* refactor: extract config read/write to the utility package

* refactor: move file contents copy to the utility package

* refactor: use Accounts instead of Users in the Store

* feature: add management server Docker file

* refactor: introduce datadir instead of config

* chore: use filepath.Join to concat filepaths instead of string concat

* refactor: move stop channel to the root

* refactor: move stop channel to the root

* review: fix PR review notes

Co-authored-by: braginini <hello@wiretrustee.com>

management/proto/management.proto

@@ -0,0 +1,31 @@
+syntax = "proto3";
+
+import "google/protobuf/descriptor.proto";
+
+option go_package = ".;proto";
+
+package management;
+
+service ManagementService {
+
+  rpc RegisterPeer(RegisterPeerRequest) returns (RegisterPeerResponse) {}
+
+  // health check endpoint
+  rpc isHealthy(Empty) returns (Empty) {}
+}
+
+message RegisterPeerRequest {
+  // Wireguard public key
+  string key = 1;
+
+  // Pre-authorized setup key
+  string setupKey = 2;
+}
+
+message RegisterPeerResponse {
+
+}
+
+message Empty {
+
+}