Optimize Docker build for faster compilation and avoid timeouts

Dockerfile

@@ -3,6 +3,11 @@
 
 FROM rustlang/rust:nightly-slim as builder
 
+# Set Rust build optimizations for faster compilation
+ENV CARGO_NET_GIT_FETCH_WITH_CLI=true
+ENV CARGO_REGISTRIES_CRATES_IO_PROTOCOL=sparse
+ENV CARGO_PROFILE_RELEASE_BUILD_OVERRIDE_DEBUG=false
+
 # Install system dependencies
 RUN apt-get update && apt-get install -y \
     pkg-config \
@@ -18,11 +23,25 @@ RUN apt-get update && apt-get install -y \
 # Set working directory
 WORKDIR /app
 
-# Copy the Brain AI source code
+# Copy manifests first for dependency caching
+COPY Cargo.toml Cargo.lock ./
+COPY crates/*/Cargo.toml ./crates/
+
+# Create empty src directories to allow dependency build
+RUN find crates -name Cargo.toml -execdir mkdir -p src \; -execdir touch src/lib.rs \;
+RUN mkdir -p src && echo "fn main() {}" > src/main.rs
+
+# Build dependencies first (this layer will be cached)
+RUN cargo build --release --bin brain; exit 0
+
+# Copy the actual source code
 COPY . .
 
-# Build Brain AI in release mode
-RUN cargo build --release --bin brain
+# Build Brain AI with optimizations for faster compilation
+RUN CARGO_PROFILE_RELEASE_LTO=off \
+    CARGO_PROFILE_RELEASE_CODEGEN_UNITS=16 \
+    CARGO_PROFILE_RELEASE_INCREMENTAL=true \
+    cargo build --release --bin brain
 
 # Runtime stage
 FROM debian:bookworm-slim