Add optional seed input

README.md

@@ -3,12 +3,14 @@ A Github action to create consistent and unique names for PR based environments.
 
 Uses [unique-names-generator](https://github.com/andreasonny83/unique-names-generator)
 and a "seed" based on the repo owner, name and issue (PR) number to generate a
-unique and consistent name. This makes it easy to deploy and clean up ephemaral
-environments on PR open, close or merge without needing to keep track of a 
+unique and consistent name.
+This makes it easy to deploy and clean up ephemaral environments on PR open, close or merge without needing to keep track of a 
 non-deterministic unique name.
+The seed can be overriden also with `seed` input.
 
 ## Inputs
-None.
+### `seed`
+String. Not required.
 
 ## Outputs
 ### `name`

action.yml

@@ -3,6 +3,9 @@ description: 'Generate a consistent, unique name based on PR'
 branding:
   icon: 'anchor'
   color: 'blue'
+inputs:
+  seed:
+    description: 'The seed to generate the name'
 outputs:
   name:
     description: 'The generated unique and consistent name'