GitHub deployment of bigger file base with Actions and FTP Deploy - deployment

Question

I'm trying to setup automatic deployment from my GitHub Repo to a shared hosting provider.
My GitHub action terminates with a timeout error after ~10 minutes and 30 seconds.
I'm not sure if it is the hosting provider or GitHub causing the problem.
I tested this config on small dummy projects and it worked without errors.
The real project that I would like to deploy is a bedrock based WordPress website with a couple of plugins included, so there are over 10.000 files.
I would be very thankful if someone has any hints, how to make this work.
Here is the error from the GitHub actions console:
Error: Server sent FIN packet unexpectedly, closing connection.
at Socket.<anonymous> (/home/runner/work/_actions/SamKirkland/FTP-Deploy-Action/4.1.0/dist/index.js:3788:56)
at Socket.emit (events.js:215:7)
at endReadableNT (_stream_readable.js:1184:12)
at processTicksAndRejections (internal/process/task_queues.js:80:21)
Error: Error: Server sent FIN packet unexpectedly, closing connection.
Here is my config yaml file:
on:
push:
branches:
- staging
name: 🚀 Deploy on push to staging
jobs:
web-deploy:
name: 🎉 Deploy
runs-on: ubuntu-latest
steps:
- name: 🚚 Get latest code
uses: actions/checkout#v2
- name: Add HTTP basic auth credentials
run: echo '${{ secrets.COMPOSER_AUTH_JSON }}' > $GITHUB_WORKSPACE/auth.json
- name: 🚚 Install composer dependecies
uses: php-actions/composer#v6
env:
ACF_PRO_KEY: ${{ secrets.ACF_PRO }}
- name: 📂 Sync files to server
uses: SamKirkland/FTP-Deploy-Action#4.1.0
with:
server: ${{ secrets.FTP_SERVER }}
username: ${{ secrets.FTP_USERNAME }}
password: ${{ secrets.FTP_PASSWORD }}
server-dir: /staging/