docs: Updated instructions to install master

docs/developer/install_master.md

@@ -5,11 +5,27 @@
 **DO NOT PERFORM THIS ON A PRODUCTION ENVIRONMENT**
 
 1. Create a new cluster (e.g., using k3s)
-1. Download latest CLI: `curl -sL https://get.keptn.sh | bash`
-1. Verify that the installation has worked and that the version is correct by running `keptn version`
-1. Install keptn using `keptn install [--use-case=continuous-delivery]`
-1. Authenticate to the Keptn Installation
-1. Verify the Keptn version you installed by using `keptn version`
+2. - Build Keptn CLI from master:
+      - download source, 
+      - go to /keptn/cli ``` go build  -o keptn main.go```
+   - Or use an older CLI from a previous release: ```curl -sL https://get.keptn.sh | KEPTN_VERSION=0.12.0 bash```
+4. Save the Keptn developer helm repo :
+```
+helm repo add keptn-dev https://charts-dev.keptn.sh
+```
+5. Do ```helm repo update```
+6. Show all developer images tag with ```helm search repo keptn-dev --devel -l ```
+7. For current master use ``<current_version>-dev`` images, for images built in a PR add ``-PR-<PR_#>`` to the tag,
+8. To install version 0.13.0-dev-PR-1234 
+``` 
+helm upgrade --install keptn keptn-dev/keptn -n keptn --create-namespace --set=continuous-delivery.enabled=true --wait --version 0.13.0-dev-PR-1234
+helm upgrade --install jmeter-service keptn-dev/jmeter-service -n keptn --wait --version 0.13.0-dev-PR-1234
+helm upgrade --install helm-service keptn-dev/helm-service -n keptn --wait --version 0.13.0-dev-PR-1234
+
+```
+7. Since this is a dev version, check the deployments, if needed, kill pods that are stuck.
+8. Authenticate to the Keptn Installation
+9. Verify the Keptn version you installed by using `keptn version`
 
 
 <details>