add documentation about local image build (#807)

Signed-off-by: Felix Breuer <f.breuer94@gmail.com>

Author: breuerfelix

README.md

@@ -26,6 +26,6 @@ Does not include:
   - [CSI Driver](docs/csi-driver.md)
 - Administration
   - [Deployment](docs/deployment.md)
-- Development
+- [Development](docs/development.md)
   - [Testing](docs/testing.md)
   - [Release Procedure](docs/release-procedure.md)

docs/development.md

@@ -0,0 +1,20 @@
+# Development
+
+## Build Container Images locally
+
+Create a classic personal access token in GitHub. Set an expiration date and enable the `write:packages` scope.  
+**Note:** Using a token generated by the `gh` cli is not sufficient.
+
+Login to the `ghcr.io` registry. When asked for a password, paste the access token:
+
+```bash
+ko login -u <your_username> --password-stdin ghcr.io
+```
+
+Build image and push to the regsitry:
+
+```bash
+make images
+```
+
+The pushed image name and tag are logged to the console.