fix(docker): fix parameter parsing and signal handling in phantun.sh (#235)

- Fix awk delimiter parsing for --tun, --tun-peer, --tun-peer6 arguments
- Change shebang from sh to bash to fix signal trap handling
- Add missing dependencies (iproute2, iptables, procps) to Dockerfile

docker/Dockerfile

@@ -25,6 +25,10 @@ FROM debian:latest
 COPY --from=builder /usr/local/bin/phantun-server /usr/local/bin/
 COPY --from=builder /usr/local/bin/phantun-client /usr/local/bin/
 COPY docker/phantun.sh /usr/local/bin/
+RUN apt-get update && apt-get install -y \
+    iproute2 \
+    iptables \
+    procps
 
 ENV USE_IPTABLES_NFT_BACKEND=0
 ENV RUST_LOG=INFO