feat: Add packet-gateway Dockerfile with eBPF dependencies and upgrade charging-engine to Rust 1.95

- Update charging-engine.Dockerfile from rust:1.94-slim to rust:1.95-slim
- Add packet-gateway.Dockerfile with rust:1.95-slim builder stage
- Add pkg-config, libssl-dev, clang, llvm, libelf-dev, and libbpf-dev build dependencies for eBPF support
- Add debian:bookworm-slim runtime stage with libssl3 and ca-certificates
- Copy circuit_breaker.rs from charging-engine for shared functionality
- Set RUST_LOG=info environment variable

deployments/docker/charging-engine.Dockerfile

@@ -1,4 +1,4 @@
-FROM rust:1.94-slim AS builder
+FROM rust:1.95-slim AS builder
 
 WORKDIR /app
 

deployments/docker/packet-gateway.Dockerfile

@@ -0,0 +1,41 @@
+FROM rust:1.95-slim as builder
+
+WORKDIR /app
+
+# Install build dependencies
+RUN apt-get update && apt-get install -y \
+    pkg-config \
+    libssl-dev \
+    clang \
+    llvm \
+    libelf-dev \
+    libbpf-dev \
+    && rm -rf /var/lib/apt/lists/*
+
+# Copy Cargo files
+COPY Cargo.toml Cargo.lock ./
+COPY apps/packet-gateway ./apps/packet-gateway
+COPY apps/charging-engine/src/circuit_breaker.rs ./apps/charging-engine/src/circuit_breaker.rs
+
+# Build the packet-gateway binary
+RUN cargo build --release --bin packet-gateway
+
+# Runtime stage
+FROM debian:bookworm-slim
+
+WORKDIR /app
+
+# Install runtime dependencies
+RUN apt-get update && apt-get install -y \
+    libssl3 \
+    ca-certificates \
+    && rm -rf /var/lib/apt/lists/*
+
+# Copy the binary from builder
+COPY --from=builder /app/target/release/packet-gateway /app/packet-gateway
+
+# Set environment variables
+ENV RUST_LOG=info
+
+# Run the binary
+CMD ["/app/packet-gateway"]