remove old openexr3 docker from CI workflow

Author: michaeldsmith

.github/workflows/docker_linuxes.yml

@@ -28,18 +28,6 @@ jobs:
     - name: Run unit tests (ctest) within the Docker image
       run: docker run ctl:latest sh -c "cd ./build && ctest"
 
-  Dockerfile_openexr3-repo-root:
-
-    runs-on: ubuntu-latest
-
-    steps:
-      - uses: actions/checkout@v4
-      - name: Build the Docker image
-        run: docker build --no-cache --rm -f ./Dockerfile_openexr3 -t ctl:latest .
-
-      - name: Run unit tests (ctest) within the Docker image
-        run: docker run ctl:latest sh -c "cd ./build && ctest"
-
   ubuntu-18-04:
 
     runs-on: ubuntu-latest