Add: Add README for set-github-user and add repository input

Document the usage of the set-github-user action and allow to specify
the to be used repository.

set-github-user/README.md

@@ -0,0 +1,34 @@
+# Setup GitHub User in a Repository
+
+GitHub Action to setup the user for a repository. Can be used to push content
+to GitHub.
+
+## Example
+
+```yml
+name: Setup GitHub User
+
+on:
+  pull_request:
+
+jobs:
+  setup-pontos:
+    name: Setup
+    runs-on: ubuntu-latest
+    steps:
+        - uses: greenbone/actions/setup-github-user@v2
+          with:
+            user: ${{ vars.user }}
+            mail: ${{ vars.mail }}
+            token: ${{ secrets.TOKEN }}
+
+```
+
+## Action Configuration
+
+|Input Variable|Description| |
+|--------------|-----------|-|
+| user | GitHub user name on behalf of whom the actions will be executed. | Required |
+| mail | Mail address for the given GitHub user. | Required |
+| token | The GitHub user's token (PAT) | Optional (default: `${{ github.token }}`) |
+| repository | GitHub repository to use | Optional (default: `${{ github.repository }}`) |

set-github-user/action.yaml

@@ -15,7 +15,10 @@ inputs:
     required: true
   token:
     description: "The GitHub user's token (PAT)"
-    required: true
+    default: ${{ github.token }}
+  repository:
+    description: "GitHub repository to use"
+    default: ${{ github.repository }}
 
 runs:
   using: "composite"
@@ -26,5 +29,5 @@ runs:
       run: |
         git config --global user.name "${{ inputs.user }}"
         git config --global user.email "${{ inputs.mail }}"
-        git remote set-url origin https://${{ inputs.token }}@github.com/${{ github.repository }}
+        git remote set-url origin https://${{ inputs.token }}@github.com/${{ inputs.repository }}
       shell: bash