Positional parameter not supported in GitHub Actions - github-actions

Question

I am starting to get along with GitHub actions, but cannot figure out a Problem here:
this is my GitHub Action yml:
name: Redwood CD for database deployment
on:
push:
branches: ['main']
env:
DATABASE_URL: ${{ secrets.DATABASE_URL }}
TEST_DATABASE_URL: postgres://postgres:postgres#localhost:5432/postgres
jobs:
build:
runs-on: ubuntu-latest
strategy:
matrix:
node-version: [16.x]
# See supported Node.js release schedule at https://nodejs.org/en/about/releases/
services:
# Label used to access the service container
postgres:
# Docker Hub image
image: postgres
# Provide the password for postgres
env:
POSTGRES_PASSWORD: postgres
# Set health checks to wait until postgres has started
options: >-
--health-cmd pg_isready
--health-interval 10s
--health-timeout 5s
--health-retries 5
ports:
# Maps tcp port 5432 on service container to the host
- 5432:5432
steps:
# .... here I fetch and build my code which works...
# then I want to tar it and deploy it to caprover --> which does not work:
- name: Compress action step
uses: a7ul/tar-action#v1.1.0
id: compress
with:
command: c
cwd: ./
files: |
/home/runner/work/redwood-tutorial/redwood-tutorial/api/dist/
/home/runner/work/redwood-tutorial/redwood-tutorial/web/dist/
captain-definition
outPath: deploy.tar
- uses: caprover/deploy-from-github#main
with:
server: '${{ secrets.CAPROVER_SERVER }}'
app: '${{ secrets.APP_NAME }}'
token: '${{ secrets.APP_TOKEN }}'
branch: '${{ secrets.DEPLOY_BRANCH }}' # optional
image: '${{ secrets.DEPLOY_IMAGE }}' # optional
and this line:
outPath: deploy.tar seems to give me the following error:
Positional parameter not supported: ./deploy.tar
does anyone know what the problem could be here? Google does not really help me here
Cheers and thanks!