Add pcap-release repo to App Runtime Platform WG

This repo does not yet exist. This PR can be merged after its approval and creation via #363

Author: plowin

toc/working-groups/app-runtime-platform.md

@@ -255,6 +255,7 @@ areas:
   - cloudfoundry/multierror
   - cloudfoundry/nats-release
   - cloudfoundry/networking-oss-deployments
+  - cloudfoundry/pcap-release
   - cloudfoundry/policy_client
   - cloudfoundry/route-registrar
   - cloudfoundry/routing-acceptance-tests