build: updating tini init command in direct mount toolbox

the tini have been removed but was still present at direct mount
used the bin/bash shell in place of tini

Closes: #9382
Signed-off-by: parth-gr <paarora@redhat.com>

deploy/examples/direct-mount.yaml

@@ -19,8 +19,8 @@ spec:
       containers:
         - name: rook-direct-mount
           image: rook/ceph:master
-          command: ["/tini"]
-          args: ["-g", "--", "/usr/local/bin/toolbox.sh"]
+          command: ["/bin/bash"]
+          args: ["-m", "-c", "/usr/local/bin/toolbox.sh"]
           imagePullPolicy: IfNotPresent
           env:
             - name: ROOK_CEPH_USERNAME