How can I get the actual workflow Job Id for composite jobs?

[mverkerk-godaddy]

I'm testing a library of github actions that uses composite jobs. When i run a workflow that uses these composite jobs, ACT sets the environment variable GITHUB_JOB to composite-job even though the job in the workflow has it's own ID.

Here's an example:

./.github/workflows/test.yml

jobs:
  build:
    runs-on: ubuntu-latest
    steps:
      - uses: ./.github/actions/my-composite

./.github/actions/my-composite/action.yml

name: my-composite
description: description

runs:
  using: composite
  steps:
    - name: Print env vars
      shell: bash
      run: |
        echo "env.GITHUB_JOB: ${{ env.GITHUB_JOB }}"

When I run this, the (truncated) act output looks like this:

...
[local-simple/build] ⭐ Run Main actions/checkout@v3
[local-simple/build]   🐳  docker cp src=/... dst=/...
[local-simple/build]   ✅  Success - Main actions/checkout@v3
[local-simple/build] ⭐ Run Main ./.github/actions/my-composite
[local-simple/build] ⭐ Run Main Print env vars
[local-simple/build]   🐳  docker exec cmd=[bash --noprofile --norc -e -o pipefail /var/run/act/workflow/2-composite-0.sh] user= workdir=
[local-simple/build]   | env.GITHUB_JOB: composite-job
[local-simple/build]   ✅  Success - Main Print env vars
[local-simple/build]   ✅  Success - Main ./.github/actions/my-composite
[local-simple/build] ⭐ Run Post ./.github/actions/my-composite
[local-simple/build]   ✅  Success - Post ./.github/actions/my-composite
[local-simple/build] 🏁  Job succeeded

Notice the output is printing env.GITHUB_JOB: composite-job - I would expect this to be build instead of composite-job

is there another variable somewhere? what is the implication of setting GITHUB_JOB to the actual workflow job-id?

I believe the related code is here:

act/pkg/runner/action_composite.go

Line 56 in 7ba9f30

JobID: "composite-job",