Ubuntu – GitHub action not read other mine github action yaml file

My plan would be to use some GH actions YAML file in my other action YAML file.

I have a list_images.yaml file in my repo: .github/workflows folder. This action looks like this:

name: List Docker Images
on: [push]

jobs:
  list_images:
    runs-on: ubuntu-latest
    steps:
      - name: List Docker images
        run: docker images

It just list the built images in a runner…

I have another action YAML file, this checks out my source code, builds an image, tags it. To test how I an use one of my action YAML file in another action YAML file, I added list_images.yaml file usage in this way:

name: Try to build image and push it into ghcr.io

on:
    push:  
        branches:
            - GhActions_test
    workflow_dispatch: 

jobs:
    build:
        runs-on: ubuntu-latest
        steps:
            - name: checkout app source code
              uses: actions/checkout@v4
            - name: Where I am
              run: pwd
              shell: bash
            - name: List current folder
              run: ls -la
              shell: bash
            - name: List workflows
              run: ls -la ./.github/workflows
              shell: bash
            - name: Build image
              run: docker compose --env-file .env.prod build app_base
            - name: tag image
              run: docker tag app:latest ghcr.io/my_org/app:1.0.0
            - name: List Docker images
              uses: ./.github/workflows/list_images.yaml            
            - name: Login to Docker Hub
              uses: docker/login-action@v3
              with:
                registry: ghcr.io
                username: ${{ secrets.DOCKERHUB_USERNAME }}
                password: ${{ secrets.DOCKERHUB_TOKEN }}              
            - name: Push image to GuitHub package repo
              run: docker push ghcr.io/my_org/app:latest
    

My problem is, that I got an error message when I want to use my list_images.yaml file:

> Error: Can't find 'action.yml', 'action.yaml' or 'Dockerfile' under
> '/home/runner/work/my_repo/my_repo/.github/actions/list_images.yaml'.
> Did you forget to run actions/checkout before running your local
> action?

I really don’t understand why not find the list_imgaes.yaml file, how ever it placed next to the caller action YAML file. The result of some steps:

1. Where I am: /home/runner/work/my_repo/my_repo

2. List workflows:

   drwxr-xr-x 2 runner docker 4096 Feb 20 09:34 .
   drwxr-xr-x 4 runner docker 4096 Feb 20 09:34 ..
   -rw-r--r-- 1 runner docker 1976 Feb 20 09:34 build_try.yaml
   -rw-r--r-- 1 runner docker  156 Feb 20 09:34 list_images.yaml
   

Any idea what’s wrong?
I know, I can put the list docker images command into the "main" action YAML file, but this is just a learning step.