Invocation of gh client results in "command not found"

[socketbox]

In a job that uses the ubuntu-latest runner, I've got a step that calls the GitHub API with the gh client, like so:

       - id: get-github-issue-url
        run: |
          issue_url=$(gh api -H "Accept: application/vnd.github+json"\                                                                            
            "repos/foo/baz-next/issues?per_page=1\&sort=created\&direction=desc&labels=npm,audit" |\
            jq -r '.[0].html_url')
          echo issue_url=$issue_url >> $GITHUB_OUTPUT

However, the step fails when I run the workflow with the following command (I'm using the GitHub-extension-installed version of act):
gh act schedule -v -s GITHUB_TOKEN=github_pat_foo -W ./.github/workflows/npm-audit.yml

The full job looks like this:

  parse:
    name: Parse audit report
    needs: scan
    if: always() && github.event_name == 'push' || github.event_name == 'schedule'
    runs-on: ubuntu-latest
    outputs:
      audit_link: ${{steps.get-github-issue-url.outputs.issue_url}}
      is-vulnerable: ${{steps.parse-audit-report.outputs.is-vulnerable}}
    steps:
      - id: get-github-issue-url
        run: |
          issue_url=$(gh api -H "Accept: application/vnd.github+json"\                                                                            
            "repos/foo/baz-next/issues?per_page=1\&sort=created\&direction=desc&labels=npm,audit" |\
            jq -r '.[0].html_url')
          echo issue_url=$issue_url >> $GITHUB_OUTPUT
      - id: parse-audit-report
        shell: python
        run: |
          import os
          import json
          
          report_dict = json.loads(os.environ.get("REPORT"))
          vulns = report_dict.get('metadata').get('vulnerabilities')
          is_vulnerable = any(vulns[severity] > 0 for severity in ['moderate', 'high', 'critical'])
          print(f"Vulnerabilities have been found: {is_vulnerable}")
          with open(os.getenv('GITHUB_OUTPUT'), 'a') as fh:
              print(f'is-vulnerable={is_vulnerable}', file=fh)
        env:
          REPORT: ${{needs.scan.outputs.audit-report}}

Here's the error I receive with verbose output:

[npm audit/Parse audit report] [DEBUG] Working directory '/home/socketbox/code/work/foo/baz-next/RWEB-8995-npm-audit-workflow'
| /var/run/act/workflow/get-github-issue-url: line 5: gh: command not found
[npm audit/Parse audit report]   ❌  Failure - Main 
issue_url=$(gh api -H "Accept: application/vnd.github+json" "repos/foo/baz-next/issues?per_page=1\&sort=created\&direction=desc&labels=npm,audit")
echo issue_url=$issue_url >> $GITHUB_OUTPUT
[npm audit/Parse audit report] exitcode '127': command not found, please refer to https://github.com/nektos/act/issues/107 for more information
[npm audit/Parse audit report] [DEBUG] Loading revision from git directory

What's got me puzzled (among other things) is that the catthehacker runner images seem to contain gh: https://github.com/catthehacker/docker_images/blob/master/linux/ubuntu/scripts/gh.sh

Update: thinking it was possible that I was using a non-standard image for the runner, I logged in to GHCR and then ran act with the -P flag:
gh act schedule -P ubuntu-latest="ghcr.io/catthehacker/ubuntu:act-22.04" -v -s GITHUB_TOKEN=github_foo -W ./.github/workflows/npm-audit.yml Still the same result. I also tried the 20.04 image, thinking that it might have been removed in the 22.04 image. No luck.

Then I shelled into the pulled image and tried to find gh. Nothing:

[2025-01-29 23:18:54]❮ docker run -i -t 0fbcdbe238bf /bin/bash
root@97ca12c2a7cf:/tmp# which gh
root@97ca12c2a7cf:/tmp# gh
bash: gh: command not found
root@97ca12c2a7cf:/tmp# echo $PATH
/opt/acttoolcache/node/18.20.5/x64/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games:/snap/bin

Versions:

[2025-01-30 09:16:16]» gh extensions list
NAME         REPO                       VERSION
gh act       nektos/gh-act              v0.2.71
gh copilot   github/gh-copilot          v1.0.6
gh sbom      advanced-security/gh-sbom  v0.1.0
gh worktree  despreston/gh-worktree     v1.0.0
[origin RWEB-8995-npm-audit-workflow][RWEB-8995-npm-audit-workflow]
[2025-01-30 09:16:20]» gh --version
gh version 2.65.0 (2025-01-06)
https://github.com/cli/cli/releases/tag/v2.65.0