fix: keep servroot off Docker Desktop bind mounts

[raoxiaoyan]

FTI-7288

[Copilot]

Pull request overview

This PR updates Pongo to keep Kong’s runtime prefix (servroot) off Docker Desktop bind mounts by moving it to a named Docker volume, improving reliability for Unix sockets on macOS/Windows and standardizing log access via in-container commands.

Changes:

• Mount /kong-plugin/servroot as a named Docker volume and ensure it’s initialized/writable in the container entrypoint.
• Update pongo tail to tail logs from inside a container (works on Docker Desktop and CI) and add runtime-prefix clearing before pongo run.
• Refresh documentation/help text to reflect the in-container runtime prefix and log access patterns.

Reviewed changes

Copilot reviewed 9 out of 9 changed files in this pull request and generated 6 comments.

Show a summary per file

File	Description
README.md	Updates debugging/log access docs and examples for the in-container runtime prefix.
pongo.sh	Adds container bash path helper, runtime-prefix volume clearing, and reworks tail to run in-container.
assets/pongo_entrypoint.sh	Sets KONG_PREFIX and ensures runtime directories exist and are writable.
assets/help/tail.txt	Clarifies that tail runs inside the Kong container and how paths are resolved.
assets/help/run.txt	Documents runtime-prefix clearing behavior and interaction with KONG_TEST_DONT_CLEAN.
assets/help/pongo.txt	Updates top-level help text for tail behavior.
assets/docker-compose.yml	Introduces pongo-kong-runtime-prefix named volume and mounts it at /kong-plugin/servroot.
assets/ci/pongo_run.helper.sh	Adjusts CI cleanup to target the runtime prefix inside the container/volume.
assets/ci/pongo_docker.test.sh	Adjusts Docker-based CI cleanup to target the runtime prefix inside the container/volume.

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