fix: Replace curl healthchecks with netcat port checks

- Use nc -z instead of curl to avoid triggering Lambda invocations during healthchecks
- Update Rust base image from 1.83 to 1.85
- Add volume mounts for hot-reload development
- Set cargo-lambda install to quiet mode
- Standardize Docker configuration for development workflow

Author: JohnBasrai

.github/workflows/ci.yml

@@ -51,7 +51,7 @@ jobs:
     - name: Wait for lambda healthcheck
       run: |
         for i in {1..20}; do
-          curl -sSf http://localhost:9000 && break || sleep 3
+          timeout 2 nc -z localhost 9000 && break || sleep 3
         done
 
     - name: Run integration tests

Dockerfile.lambda-runtime

@@ -1,4 +1,4 @@
-FROM rust:1.83-slim
+FROM rust:1.85-slim
 
 # Install system deps for building Rust packages and running cargo-lambda
 RUN apt-get update && apt-get install -y \
@@ -13,12 +13,13 @@ RUN apt-get update && apt-get install -y \
 ENV PATH="/usr/local/cargo/bin:${PATH}"
 
 # Install cargo-lambda
-RUN cargo install cargo-lambda --version 1.8.5 --locked
+RUN cargo install cargo-lambda --version 1.8.5 --locked --quiet
 
 # Default user
 RUN useradd -m dev
-USER dev
 WORKDIR /app
 
-# Entry point optional
-CMD ["bash"]
+USER root
+
+# Entry point overriden by docker-compose.yml
+CMD [ "bash" ]

docker-compose.yml

@@ -1,15 +1,23 @@
 
 services:
   lambda:
+    user: root # We're currently in dev mode so this is Ok, don't do this for production
     build:
       context: .
       dockerfile: Dockerfile.lambda-runtime
-    environment:
-      RUST_LOG=info
     ports:
       - "9000:9000"
+    volumes:
+      - ./src:/app/src          # hot-reload watch point
+      - ./Cargo.toml:/app/Cargo.toml
+      - ./Cargo.lock:/app/Cargo.lock
+      - ${CR8S_SCRATCH_DIR:-/var/tmp}/aws/dev-cargo:/usr/local/cargo/registry
+      - ${CR8S_SCRATCH_DIR:-/var/tmp}/aws/dev-target:/app/target
+    environment:
+      RUST_LOG: info
     healthcheck:
-      test: ["CMD", "curl", "-f", "http://localhost:9000"]
-      interval: 5s
-      timeout: 2s
-      retries: 10
+        test: ["CMD", "nc", "-z", "localhost", "9000"]
+        interval: 5s
+        timeout: 2s
+        retries: 10
+    command: [ "cargo", "lambda", "watch" ]