feat: add upload chunker

Signed-off-by: kjuulh <contact@kjuulh.io>

crates/flux-releaser/schemas/proto/flux_releaser.proto

@@ -2,16 +2,25 @@ syntax = "proto3";
 
 package flux_releaser;
 
-service Greeter {
-  rpc SayHello (HelloRequest) returns (HelloReply) {}
+service FluxReleaser {
+  rpc UploadArtifact (stream UploadArtifactRequest) returns (UploadArtifactResponse) {}
+  rpc CommitArtifact (CommitArtifactRequest) returns (CommitArtifactResponse) {}
 }
 
-message HelloRequest {
+message UploadArtifactRequest {
+  bytes content = 1;
+}
+
+message UploadArtifactResponse {
+  string upload_id  = 1;
+}
+
+message CommitArtifactRequest {
   string app = 1;
   string branch = 2;
-  string folder = 3; // Change to files instead
+  string folder = 3;
 }
 
-message HelloReply {
+message CommitArtifactResponse {
   string artifact_id = 1;
 }