remove possibility to push from the main branch and make the dev cont…

…ainer CI job just a test

.github/workflows/dev-container.yml

@@ -1,6 +1,5 @@
 name: 'devcontainer CI' 
 on:
-  workflow_dispatch:
   pull_request:
     branches:
       - main
@@ -12,56 +11,24 @@ on:
 
 jobs:
   build_devcontainer:
-    # only run for LCAS repositories
-    if: github.repository_owner == 'LCAS' || github.repository_owner == 'lcas'
-    runs-on: lcas
+    runs-on: ubuntu-latest
     strategy:
       matrix:
         config: 
           - cuda-opengl
     steps:
-      - name: Node Js
-        uses: actions/setup-node@v4
-        with:
-          node-version: "^16.13.0 || >=18.0.0"
-
       - name: Checkout from github
         uses: actions/checkout@v3
       - name: extract the github reference
         run: echo "BRANCH=${GITHUB_REF##*/}" >> $GITHUB_ENV
       - name: "image name from repo name"
         id: docker_image_name
         run: echo "docker_image=${{ github.repository }}" | tr '[:upper:]' '[:lower:]' |sed 's/[^0-9,a-z,A-Z,=,_,\/]/-/g' >>${GITHUB_OUTPUT}
-
-      - name: Docker Login LCAS
-        # don't attempt to login for PRs
-        if: ${{ github.event_name != 'pull_request' }} 
-        # You may pin to the exact commit or the version.
-        # uses: docker/login-action@f054a8b539a109f9f41c372932f1ae047eff08c9
-        uses: docker/login-action@v2
-        with:
-          # Server address of Docker registry. If not set then will default to Docker Hub
-          registry: lcas.lincoln.ac.uk
-          # Username used to log against the Docker registry
-          username: ${{ secrets.LCAS_REGISTRY_PUSHER }}
-          # Password or personal access token used to log against the Docker registry
-          password: ${{ secrets.LCAS_REGISTRY_TOKEN }}
-
       - name: Build dev container task
-        if: ${{ github.event_name == 'pull_request' }} 
         uses: devcontainers/[email protected]
         with:
           imageName: lcas.lincoln.ac.uk/devcontainer/${{ steps.docker_image_name.outputs.docker_image }}
           configFile: ./.devcontainer/${{ matrix.config }}/devcontainer.json
           push: never
           imageTag: ${{ matrix.config }}-${{ env.BRANCH }}
           #runCmd: "bash .devcontainer/run-ci.sh"
-      - name: Build and push dev container image
-        if: ${{ github.event_name != 'pull_request' }} 
-        uses: devcontainers/[email protected]
-        with:
-          imageName: lcas.lincoln.ac.uk/devcontainer/${{ steps.docker_image_name.outputs.docker_image }}
-          configFile: ./.devcontainer/${{ matrix.config }}/devcontainer.json
-          push: always
-          imageTag: ${{ matrix.config }}-${{ env.BRANCH }}
-          #runCmd: "bash .devcontainer/run-ci.sh"