Change pgbackrest init for running containers

In testing, we found that a running pgbackrest container wouldn't
get the permissions adjusted with a mkdir; so we're switching to
an install for now.

internal/pgbackrest/config.go

@@ -152,7 +152,7 @@ func MakePGBackrestLogDir(template *corev1.PodTemplateSpec,
 	}
 
 	container := corev1.Container{
-		Command:         []string{"bash", "-c", "umask 000 && mkdir -m 777 -p " + pgBackRestLogPath},
+		Command:         []string{"bash", "-c", "umask 000 && install -m 777 -d " + pgBackRestLogPath},
 		Image:           config.PGBackRestContainerImage(cluster),
 		ImagePullPolicy: cluster.Spec.ImagePullPolicy,
 		Name:            naming.ContainerPGBackRestLogDirInit,

internal/pgbackrest/config_test.go

@@ -292,7 +292,7 @@ func TestMakePGBackrestLogDir(t *testing.T) {
 	for _, c := range podTemplate.Spec.InitContainers {
 		if c.Name == naming.ContainerPGBackRestLogDirInit {
 			// ignore "bash -c", should skip repo with no volume
-			assert.Equal(t, "umask 000 && mkdir -m 777 -p /pgbackrest/repo2/log", c.Command[2])
+			assert.Equal(t, "umask 000 && install -m 777 -d /pgbackrest/repo2/log", c.Command[2])
 			assert.Equal(t, c.Image, "test-image")
 			assert.Equal(t, c.ImagePullPolicy, corev1.PullAlways)
 			assert.Assert(t, !cmp.DeepEqual(c.SecurityContext,