core: add ROOK_REVISION_HISTORY_LIMIT operator setting

This adds an operator config setting ROOK_REVISION_HISTORY_LIMIT
defaulting to kubernetes'value for RevisionHistoryLimit.

If configured, the provided value will be used as RevisionHistoryLimit

for all Deployments rook creates.

Fixes: #12722

Signed-off-by: Michael Adam <obnox@samba.org>
(cherry picked from commit ab8fd90aa6)

pkg/operator/ceph/controller/controller_utils_test.go

@@ -133,6 +133,33 @@ func TestSetEnforceHostNetwork(t *testing.T) {
 	assert.False(t, EnforceHostNetwork())
 }
 
+func TestSetRevisionHistoryLimit(t *testing.T) {
+	opConfig := map[string]string{}
+	t.Run("ROOK_REVISION_HISTORY_LIMIT: test default value", func(t *testing.T) {
+		SetRevisionHistoryLimit(opConfig)
+		assert.Nil(t, RevisionHistoryLimit())
+	})
+
+	var value string = "foo"
+	t.Run("ROOK_REVISION_HISTORY_LIMIT: test invalid value 'foo'", func(t *testing.T) {
+		opConfig[revisionHistoryLimitSettingName] = value
+		SetRevisionHistoryLimit(opConfig)
+		assert.Nil(t, RevisionHistoryLimit())
+	})
+
+	t.Run("ROOK_REVISION_HISTORY_LIMIT: test empty string value", func(t *testing.T) {
+		value = ""
+		opConfig[revisionHistoryLimitSettingName] = value
+		SetRevisionHistoryLimit(opConfig)
+		assert.Nil(t, RevisionHistoryLimit())
+	})
+	t.Run("ROOK_REVISION_HISTORY_LIMIT:  test valig value '10'", func(t *testing.T) {
+		value = "10"
+		opConfig[revisionHistoryLimitSettingName] = value
+		SetRevisionHistoryLimit(opConfig)
+		assert.Equal(t, int32(10), *RevisionHistoryLimit())
+	})
+}
 func TestIsReadyToReconcile(t *testing.T) {
 	scheme := scheme.Scheme
 	scheme.AddKnownTypes(cephv1.SchemeGroupVersion, &cephv1.CephCluster{}, &cephv1.CephClusterList{})