ci: ensure dispatch of infrastructure works similar as dispatch of ap…

…ps (#952)

<!--- Provide a general summary of your changes in the Title above -->

## Description
Using the same input type as dispatching of apps. Later we need to
separate between version and ref to ensure we can hot-deploy to staging
without needing a git-tag
<!--- Describe your changes in detail -->

## Related Issue(s)

- #{issue number}

## Verification

- [ ] **Your** code builds clean without any errors or warnings
- [ ] Manual testing done (required)
- [ ] Relevant automated test added (if you find this hard, leave it and
we'll help out)

## Documentation

- [ ] Documentation is updated (either in `docs`-directory, Altinnpedia
or a separate linked PR in
[altinn-studio-docs.](https://github.com/Altinn/altinn-studio-docs), if
applicable)

.github/workflows/dispatch-apps.yml

@@ -13,7 +13,7 @@ on:
           - staging
           - prod
       version:
-        description: "Version to deploy"
+        description: "Version to deploy (exclude the v prefix)"
         required: true
         type: string
       runMigration:

.github/workflows/dispatch-infrastructure.yml

@@ -13,7 +13,7 @@ on:
           - staging
           - prod
       version:
-        description: "Version to deploy. Needs to be a git tag"
+        description: "Version to deploy. Needs to be a git tag (exclude the v prefix)"
         required: true
         type: string
 
@@ -40,4 +40,4 @@ jobs:
       environment: ${{ inputs.environment }}
       region: norwayeast
       version: ${{ inputs.version }}
-      ref: "refs/tags/${{ inputs.version }}"
+      ref: "refs/tags/v${{ inputs.version }}"