Added additional tools for troubleshooting

Author: mrajagopal

nginx-debugger/Dockerfile

@@ -1,7 +1,10 @@
 FROM alpine:latest
 COPY --chmod=744 --from=project api_stats.sh /root/api_stats.sh
 
-RUN apk --update add bind-tools curl netcat-openbsd iproute2 iperf tcpdump tshark bash jq \
+RUN set -ex \
+  && apk --update add --no-cache \
+  bind-tools curl netcat-openbsd iproute2 \
+  iperf tcpdump tshark bash jq \
   && rm -rf /var/cache/apk/* \
   && ln -s /usr/bin/iperf /usr/local/bin/iperf \
   && ls -altrh /usr/local/bin/iperf