Makefile: Fix CONTAINER_OPTS for Fedora
Fedora based distributions don't use AppArmor but SELinux instead.
This change detects the distribution and sets the --security-opts
accordingly.
DOCKER_CI_IMAGE = go-ceph-ci
CONTAINER_CMD := docker
-CONTAINER_OPTS := --security-opt apparmor:unconfined
+CONTAINER_OPTS := --security-opt $(shell grep -q selinux /sys/kernel/security/lsm && echo "label=disabled" || echo "apparmor:unconfined")
VOLUME_FLAGS :=
SELINUX := $(shell getenforce 2>/dev/null)
