added integration tests and added message with attachments

Dockerfile

@@ -0,0 +1,43 @@
+# Stage 1: Builder - Always uses the latest stable Rust version
+FROM rust:latest AS builder
+
+WORKDIR /app
+
+# Install build dependencies
+RUN apt-get update && apt-get install -y cmake pkg-config libssl-dev
+
+# 1. Cache dependencies (standard Rust optimization)
+COPY Cargo.toml Cargo.lock ./
+RUN mkdir src && echo "fn main() {}" > src/main.rs
+RUN cargo build --release
+RUN rm -rf src
+
+# 2. Build the actual application
+COPY src ./src
+# Ensure the compiler sees the new source files
+RUN touch src/main.rs 
+RUN cargo build --release
+
+# Stage 2: Runtime - Minimal image
+FROM debian:bookworm-slim
+
+# Install runtime libraries (SSL is required for Postgres/SQLx)
+RUN apt-get update && apt-get install -y libssl3 ca-certificates && rm -rf /var/lib/apt/lists/*
+
+WORKDIR /app
+
+# Copy the binary from builder
+# Note: if your Cargo.toml 'name' is different, change 'frangipane' to your binary name
+COPY --from=builder /app/target/release/frangipane /usr/local/bin/frangipane
+
+# Create storage for avatars
+RUN mkdir -p /var/lib/frangipane/avatars
+
+# Default environment
+ENV RUST_LOG="info"
+
+# Expose Axum port
+EXPOSE 8080
+
+# Command to run. 'db' matches the service name in docker-compose.yml
+CMD ["frangipane", "--database", "db:5432", "--port", "8080", "--data-dir", "/var/lib/frangipane"]