remove github/workflows

.github/workflows/dockerimage.yml

@@ -1,20 +0,0 @@
-name: Docker Image CI
-
-on:
-  push:
-    branches:
-      - master
-
-jobs:
-  build:
-    runs-on: ubuntu-latest
-    steps:
-    - uses: actions/checkout@v1
-    - name: Build the Docker image
-      run: docker build . --file Dockerfile --tag peerjs/peerjs-server:latest
-    - name: Publish to Registry
-      uses: elgohr/Publish-Docker-Github-Action@master
-      with:
-        name: peerjs/peerjs-server:latest
-        username: ${{ secrets.DOCKER_USERNAME }}
-        password: ${{ secrets.DOCKER_PASSWORD }}