Add GitHub agentic workflow (gh-aw) instrumentation

[Copilot]

github/gh-aw/actions/setup is a JavaScript action that writes shell scripts to a configurable destination directory. Those scripts are subsequently invoked via absolute paths, bypassing the normal shell instrumentation pipeline.

Changes

• actions/instrument/job/decorate_action.sh: After any JavaScript action completes successfully, detect if it was github/gh-aw/actions/setup (via GITHUB_ACTION_REPOSITORY + GITHUB_ACTION_PATH suffix check) and inject . otel.sh after the shebang in every .sh file found recursively under INPUT_DESTINATION

if [ "$exit_code" = 0 ] && [ "${GITHUB_ACTION_REPOSITORY:-}" = "github/gh-aw" ] && \
   case "${GITHUB_ACTION_PATH%/}" in */actions/setup) true;; *) false;; esac && \
   [ -n "${INPUT_DESTINATION:-}" ]; then
  find "${INPUT_DESTINATION}" -name "*.sh" 2>/dev/null | while IFS= read -r script_file; do
    sed -i 's~#!/bin/sh~#!/bin/sh\n. otel.sh~g' "$script_file" 2>/dev/null || true
    sed -i 's~#!/bin/bash~#!/bin/bash\n. otel.sh~g' "$script_file" 2>/dev/null || true
  done || true
fi

Pre-instrumenting the files at setup time means they are self-instrumenting regardless of how they are later invoked (absolute path, relative path, sourced). The || true / 2>/dev/null guards ensure the original exit_code is never affected. Follows the same sed pattern used by the copilot and CodeQL instrumentation modules.

[plengauer]

Hello, thanks for contributing for the first time!

[plengauer]

@copilot please address the changes

[Copilot]

Pull request overview

Note

Copilot was unable to run its full agentic suite in this review.

This PR adds post-action instrumentation for the github/gh-aw/actions/setup JavaScript action by rewriting generated shell scripts so they source otel.sh, ensuring OpenTelemetry instrumentation is applied even when scripts are invoked via absolute paths.

Changes:

• Detect successful completion of github/gh-aw/actions/setup and locate the action’s configured INPUT_DESTINATION.
• Recursively find *.sh files under INPUT_DESTINATION and insert . otel.sh after common shebangs using sed -i.