update drone signature (#143)

* update drone signature

* add drone config update instructions

Author: kevinwcyu

.drone.yml

@@ -34,6 +34,6 @@ steps:
 
 ---
 kind: signature
-hmac: dabf2613950066fd502238aeacf42600215e93853dc525e055d32027090867db
+hmac: 5d68e6853a869ce0945e58f00f86b4612e57d21d3e8dfff3b3807e0544658690
 
 ...

README.md

@@ -9,3 +9,20 @@ see the ./pkg folder
 ## Frontend configuration
 
 Frontend code has been moved to https://github.com/grafana/grafana-aws-sdk-react
+
+## Drone configuration
+
+Drone signs the Drone configuration file. This needs to be run every time the drone.yml file is modified. See https://github.com/grafana/deployment_tools/blob/master/docs/infrastructure/drone/signing.md for more info.
+
+### Update drone build
+
+If you have not installed drone CLI follow [these instructions](https://docs.drone.io/cli/install/)
+
+To sign the `.drone.yml` file:
+
+```bash
+# Get your drone token from https://drone.grafana.net/account
+export DRONE_TOKEN=<Your DRONE_TOKEN>
+
+mage drone
+```