remove centos7 from github workflow, centos7 is EOL 2024-06-30 (#161)

- removing from Centos7 from github workflow because Centos7 is now End-of-Life, https://blog.centos.org/2023/04/end-dates-are-coming-for-centos-stream-8-and-centos-linux-7/

.github/workflows/docker_linuxes.yml

@@ -120,18 +120,6 @@ jobs:
  - name: Run unit tests (ctest) within the Docker image
  run: docker run ctl:latest sh -c "cd ./build && ctest"
 
- centos7:
-
- runs-on: ubuntu-latest
-
- steps:
- - uses: actions/checkout@v4
- - name: Build the Docker image
- run: docker build --no-cache --rm -f ./docker/Dockerfile_centos_7 -t ctl:latest .
-
- - name: Run unit tests (ctest) within the Docker image
- run: docker run ctl:latest sh -c "cd ./build && ctest"
-
  redhat-ubi8:
 
  runs-on: ubuntu-latest