[RFC0048] Implement cf-pcap feature for apps

[maxmoehl]

Proposed Change

As a developer,
I want to capture network packets in my app container
so that I can troubleshoot issues with my app.

Implement the feature as described in RFC0048 to allow app developers to capture network packets in their app containers and relay them out via SSH.

Acceptance criteria

Via SSH a binary can be called which will execute a packet capture with a given filter and snaplen and print the binary pcap format to stdout so that it can be transferred via SSH and saved on the client side.

Related links

Tracking issue: cloudfoundry/community#1374
RFC: https://github.com/cloudfoundry/community/blob/main/toc/rfc/rfc-0048-pcap-cf.md

Pull-Requests

• CF PCAP #1092
• Introduce libpcap and cf-pcap support wg-app-platform-runtime-ci#115
• Add support for extracting xattrs on unix archiver#74