Publish GitHub Action to Marketplace: Unexpected value 'steps' - github-actions

Question

I was using the workflow below in a project. However, I wanted to share this with other people and figured posting it as a GitHub Action to the marketplace would be the most user-friendly option. I created a new repo with action.yml and other required files. However, even after editing the workflow, I was unable to get past the Set up job stage. I would like to know which tweaks I need to make in order to have a valid action.yml that does the same as the original workflow as I don't have any experience with this yet. The original workflow, action.yml and error message can be found below. The original workflow works as intended, but not when executed by the uses keyword.
Original workflow (works as intended):
name: Yaml autosync
description: Auto-sync changes to a template YAML localisation file to all other YAML files in the same directory.
branding:
icon: file-text
color: blue
inputs:
lang_path:
description: 'Path to the folder that contains all lang files'
default: .
required: false
default_file:
description: 'The name of the YAML file that contains all default options. These values are used to fill in any missing info in the other files.'
default: 'default.yml'
required: false
github_token:
description: 'The secret GitHub Token so this action has push access. Make sure to use GitHub secrets and do not push any private info!'
required: true
on: [push]
jobs:
build:
runs-on: ubuntu-latest
env:
LANG_PATH: ${INPUT_LANG_PATH}
DEFAULTS: ${INPUT_DEFAULT_FILE}
steps:
- uses: actions/checkout#v2
with:
persist-credentials: false
fetch-depth: 0
- name: Set up JDK 1.8
uses: actions/setup-java#v1
with:
java-version: 1.8
- name: Clone YAML-localisation-sync
run: git clone some_repo
- name: Building the project
run: |
cd YAML-localisation-sync
mvn package
- name: Moving JAR file
run: cp YAML-localisation-sync/target/YamlLocalisation.jar ${LANG_PATH}
- name: Running JAR file
run: |
cd ${LANG_PATH}
java -jar YamlLocalisation.jar ${DEFAULTS}
- name: Repo cleanup
run: |
rm -rf YAML-localisation-sync
cd ${LANG_PATH}
rm YamlLocalisation.jar
- name: Commit changes
run: |
git config --local user.email "41898282+github-actions[bot]#users.noreply.github.com"
git config --local user.name "YAML sync bot"
git add .
git commit -m "Sync YAML localisation files"
git fetch
continue-on-error: true
- name: Push changes
uses: ad-m/github-push-action#master
with:
github_token: ${INPUT_GITHUB_TOKEN}
force: true
Action.yml (workflow above, updated to work as a GitHub Action on the marketplace)
name: Yaml autosync
description: Auto-sync changes to a template YAML localisation file to all other YAML files in the same directory.
branding:
icon: file-text
color: blue
inputs:
lang_path:
description: 'Path to the folder that contains all lang files'
default: .
required: false
default_file:
description: 'The name of the YAML file that contains all default options. These values are used to fill in any missing info in the other files.'
default: 'default.yml'
required: false
github_token:
description: 'The secret GitHub Token so this action has push access. Make sure to use GitHub secrets and do not push any private info!'
required: true
on: [push]
runs:
using: "composite"
env:
LANG_PATH: ${INPUT_LANG_PATH}
DEFAULTS: ${INPUT_DEFAULT_FILE}
steps:
- run: git clone https://github.com/MyProfile/YAML-localisation-sync.git
shell: bash
- run: |
cd YAML-localisation-sync
mvn package
shell: bash
- run: cp YAML-localisation-sync/target/YamlLocalisation.jar ${LANG_PATH}
shell: bash
- run: |
cd ${LANG_PATH}
java -jar YamlLocalisation.jar ${DEFAULTS}
shell: bash
- run: |
rm -rf YAML-localisation-sync
cd ${LANG_PATH}
rm YamlLocalisation.jar
shell: bash
run: |
git config --local user.email "41898282+github-actions[bot]#users.noreply.github.com"
git config --local user.name "YAML sync bot"
git add .
git commit -m "Sync YAML localisation files"
git fetch
shell: bash
continue-on-error: true
Workflow that has the error (in a repo that is used to test the published GitHub action)
name: GitHub Actions
on: [push]
jobs:
build:
runs-on: ubuntu-latest
steps:
- uses: actions/checkout#v2
with:
persist-credentials: false
fetch-depth: 0
- name: Set up JDK 1.8
uses: actions/setup-java#v1
with:
java-version: 1.8
- name: Yaml autosync
uses: MyProfile/MyRepo#15
with:
github_token: ${secrets.GITHUB_TOKEN}
lang_path: foldertest/
default_file: en.yml
Error message
Current runner version: '2.277.1'
Operating System
Virtual Environment
GITHUB_TOKEN Permissions
Prepare workflow directory
Prepare all required actions
Getting action download info
Download action repository 'actions/checkout#v2'
Download action repository 'actions/setup-java#v1'
Download action repository 'MyProfile/MyAction#15'
Error: MyProfile/MyAction/15/action.yml (Line: 28, Col: 3): Unexpected value 'steps'
Error: MyProfile/MyAction/15/action.yml (Line: 28, Col: 3): Unexpected value 'steps'
Error: System.ArgumentNullException: Value cannot be null. (Parameter 'You are using a composite action but there are no steps provided in MyProfile/MyAction/15/action.yml.')
at GitHub.Runner.Worker.ActionManifestManager.ConvertRuns(IExecutionContext executionContext, TemplateContext templateContext, TemplateToken inputsToken, String fileRelativePath, MappingToken outputs)
at GitHub.Runner.Worker.ActionManifestManager.Load(IExecutionContext executionContext, String manifestFile)
Error: Fail to load MyProfile/MyAction/15/action.yml