Update Docker testing setup for firewalld

The Docker testing environment for firewalld has been updated. The test-firewalld.yml workflow was changed to run the Docker container with systemd initialization and wait for the container to fully initialize before running the tests. Furthermore, the Dockerfile.firewalld was modified with the removal of the ENTRYPOINT directive.

.github/workflows/test-firewalld.yml

@@ -22,4 +22,11 @@ jobs:
 
     - name: Run tests
       run: |
-        docker run --init --privileged --rm -v /sys/fs/cgroup:/sys/fs/cgroup:ro my-firewalld-image bash -c "./firewalld-tests.sh"
+        # Run the container with systemd initialization
+        docker run --privileged --name firewalld-container -d -v /sys/fs/cgroup:/sys/fs/cgroup:ro my-firewalld-image /usr/sbin/init
+
+        # Wait for the container to be fully initialized
+        sleep 10
+
+        # Run tests inside the container
+        docker exec -it firewalld-container /bin/bash -c "./firewalld-tests.sh"

Dockerfile.firewalld

@@ -33,6 +33,4 @@ RUN (cd /lib/systemd/system/sysinit.target.wants/; for i in *; do [ $i == system
 
 VOLUME [ "/sys/fs/cgroup" ]
 
-ENTRYPOINT ["/lib/systemd/systemd"]
-
 CMD ["/sbin/init"]