remove docker-build action

.github/workflows/docker-image.yml

@@ -1,21 +0,0 @@
-name: Docker Image CI
-
-on:
-  push:
-    branches: [ "main" ]
-    tags:
-      - 'v*.*'
-  pull_request:
-    branches: [ "main" ]
-  workflow_dispatch:
-
-jobs:
-
-  build:
-
-    runs-on: ubuntu-latest
-
-    steps:
-    - uses: actions/checkout@v3
-    - name: Build the Docker image
-      run: docker build . --file Dockerfile --tag pchl:$(date +%s)