fix: Safe not mounted detection

Install util-linux versions of mount/umount (instead of default busybox versions) to pass the 'safe not mounted' test in mount-utils

See https://github.com/kubernetes/mount-utils/blob/dfd453c575c09ba21aa9f45bf9a9ddb8724c5e0b/mount_linux.go#L317

Author: hrak

cmd/cloudstack-csi-driver/Dockerfile

@@ -11,8 +11,10 @@ RUN apk add --no-cache \
     e2fsprogs-extra \
     # Provides mkfs.xfs
     xfsprogs \
-    # Provides blkid, also used by k8s.io/mount-utils
-    blkid
+    # blkid, mount and umount are required by k8s.io/mount-utils \
+    blkid \
+    mount \
+    umount
 
 COPY ./bin/cloudstack-csi-driver /cloudstack-csi-driver
 ENTRYPOINT ["/cloudstack-csi-driver"]