[bitnami/influxdb] Update docs (#26560)

Signed-off-by: Gonzalo Gomez Gracia <[email protected]>

bitnami/influxdb/README.md

@@ -118,6 +118,10 @@ In addition to these options, you can also set an external ConfigMap with all th
 
 The allowed extensions are `.sh`, and `.txt`.
 
+### Migrating InfluxDB 1.x data into 2.x format
+
+The [Bitnami InfluxDB™](https://github.com/bitnami/containers/tree/main/bitnami/influxdb) image allows you to migrate your InfluxDB 1.x data into 2.x format by setting the `INFLUXDB_INIT_MODE=upgrade` environment variable, and mounting the InfluxDB 1.x data into the container (let the initialization logic know where it is located with the `INFLUXDB_INIT_V1_DIR` variable). Do not point `INFLUXDB_INIT_V1_DIR` into `INFLUXDB_VOLUME_DIR` (default: `/bitnami/influxdb`), or the upgrade process will fail.
+
 ### Setting Pod's affinity
 
 This chart allows you to set your custom affinity using the `XXX.affinity` parameter(s). Find more information about Pod's affinity in the [kubernetes documentation](https://kubernetes.io/docs/concepts/configuration/assign-pod-node/#affinity-and-anti-affinity).
@@ -616,4 +620,4 @@ Unless required by applicable law or agreed to in writing, software
 distributed under the License is distributed on an "AS IS" BASIS,
 WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 See the License for the specific language governing permissions and
-limitations under the License.
+limitations under the License.