add dev container and default ip

Dockerfile

@@ -1,11 +1,13 @@
-FROM rust:alpine AS builder
+FROM rust:alpine AS dev-container
+
+RUN apk add --no-cache protobuf-dev git musl-dev lld openssl-dev openssl-libs-static
+
+FROM dev-container as builder
 
 WORKDIR /app
 
 COPY . .
 
-RUN apk add --no-cache protobuf-dev git musl-dev lld openssl-dev openssl-libs-static
-
 RUN git submodule update --init --recursive
 
 RUN OPENSSL_LIB_DIR=/usr/lib OPENSSL_INCLUDE_DIR=/usr/include/openssl OPENSSL_STATIC=1 RUSTFLAGS="-C relocation-model=static -C linker=ld.lld" cargo test --target x86_64-unknown-linux-musl
@@ -32,3 +34,6 @@ ENTRYPOINT ["/backend_server_secure"]
 FROM scratch AS backend-secure
 COPY --from=builder /app/target/x86_64-unknown-linux-musl/release/backend_server_secure /backend_server_secure
 ENTRYPOINT ["/backend_server_secure"]
+
+# make sure the final output container is the dev container so that we can use it from the devcontainer.json
+FROM final as dev-container

devcontainer.json

@@ -0,0 +1,3 @@
+{
+  "build": { "dockerfile": "Dockerfile" }
+}

rnex-core/src/executables/common.rs

@@ -6,8 +6,8 @@ use crate::nex::account::Account;
 pub static OWN_IP_PRIVATE: Lazy<Ipv4Addr> = Lazy::new(|| {
     env::var("SERVER_IP")
         .ok()
-        .and_then(|s| s.parse().ok())
-        .expect("SERVER_IP not specified")
+        .map(|s| s.parse().expect("invalid ip address"))
+        .unwrap_or(Ipv4Addr::UNSPECIFIED)
 });
 
 pub static OWN_IP_PUBLIC: Lazy<Ipv4Addr> = Lazy::new(|| {