Fix: Reply; Add: Docker build

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "nostr-relay"
-version = "0.0.2"
+version = "0.0.3"
 edition = "2024"
 
 [dependencies]

Dockerfile

@@ -5,10 +5,15 @@ WORKDIR /usr/src/app
 
 ENV RUSTFLAGS="-C target-feature=+crt-static"
 COPY Cargo.toml Cargo.lock ./
+RUN --mount=type=cache,target=/usr/local/cargo/registry \
+    --mount=type=cache,target=/usr/local/cargo/git \
+    rustup target add x86_64-unknown-linux-musl \
+    && cargo fetch --locked --target x86_64-unknown-linux-musl
+
 COPY src ./src
 RUN --mount=type=cache,target=/usr/local/cargo/registry \
     --mount=type=cache,target=/usr/local/cargo/git \
-    rustup target add x86_64-unknown-linux-musl && cargo build --release --target x86_64-unknown-linux-musl
+    cargo build --release --target x86_64-unknown-linux-musl
 
 FROM alpine:latest
 RUN apk add --no-cache libgcc

src/main.rs

@@ -544,7 +544,8 @@ impl RelayMessage {
         sub_id: &str,
         to_client_msg_tx: &mpsc::Sender<String>,
     ) {        
-        let msg = "[\"EVENT\", \"".to_string() + sub_id + "\", " + &event.serialize() + "]";
+        let event = serde_json::to_string(event).unwrap();
+        let msg = "[\"EVENT\", \"".to_string() + sub_id + "\", " + &event + "]";
         if let Err(e) = to_client_msg_tx.send(msg).await {
             error!("Failed to send message: {}", e);
         }