run-docker.sh: Disable SELinux for the container and update the image tag

On Fedora and similar SELinux by default prevents containers accessing
mounted host directories. This script is just used for testing,
so disable it.

.gitlab-ci/run-docker.sh

@@ -2,10 +2,10 @@
 
 set -e
 
-TAG="lazka/gitlab-gtk:v1"
+TAG="ebassi/gitlab-gtk:latest"
 
 sudo docker build --build-arg HOST_USER_ID="$UID" --tag "${TAG}" \
     --file "Dockerfile" .
-sudo docker run --rm \
+sudo docker run --rm --security-opt label=disable \
     --volume "$(pwd)/..:/home/user/app" --workdir "/home/user/app" \
     --tty --interactive "${TAG}" bash