Sync READMEs from main

Signed-off-by: GITHUB_ACTOR <[email protected]>

README.md

@@ -25,7 +25,7 @@ Then you can install chart using:
 helm install my-trino trino/trino --version 0.21.0
 ```
 
-Also, you can check the manifests using: 
+Also, you can check the manifests using:
 
 ```console
 helm template my-trino trino/trino --namespace <YOUR_NAMESPACE>
@@ -34,3 +34,40 @@ helm template my-trino trino/trino --namespace <YOUR_NAMESPACE>
 ## Documentation
 
 You can find documentation about the chart [here](./charts/trino/README.md).
+
+## Development
+
+To test the chart, install it into a Kubernetes cluster. Use `kind` to create a
+Kubernetes cluster running in a container, and `chart-testing` to install the
+chart and run [tests](charts/trino/templates/tests).
+
+```console
+brew install helm kind chart-testing
+kind create cluster
+ct install
+```
+
+To run tests with specific values:
+```console
+ct install --helm-extra-set-args "--set image.tag=448"
+```
+
+Use the `test.sh` script to run a suite of tests, with different chart values.
+If some of the tests fail, use the `-s` flag to skip cleanup and inspect the
+resources installed in the Kubernetes cluster. Use `-n` to use a specific
+namespace, not a randomly generated one. Use `-t` to run only selected tests.
+See the command help (`-h`) for a list of available tests.
+
+Example:
+```console
+./test.sh -n trino -s -t default
+```
+
+The documentation is automatically generated from the chart files. Install a
+git hook to have it automatically updated when committing changes. Make sure
+you [install the pre-commit binary](https://pre-commit.com/#install), then run:
+
+```console
+pre-commit install
+pre-commit install-hooks
+```