Added git credential inputs

Author: Xerner

action.yaml

@@ -7,7 +7,7 @@ branding:
 inputs:
   manifest_url:
     description: 'Specifies the url or git repo to fetch the manifest from. Used in repo init'
-    required: true
+    required: false
     default: https://github.com/${{ github.repository_owner }}/manifests
   manifest_branch:
     description: 'Specifies what manifest branch to use. Used in repo init'
@@ -17,6 +17,13 @@ inputs:
     description: 'Specifies the name of the manifest file to find. Used in repo init'
     required: false
     default: default.xml
+  username:
+    description: 'The username to use when authenticating to the manifest server'
+    required: false
+    default: ${{ github.actor }}
+  password:
+    description: 'The password or token to use when authenticating while fetching the manifest and git fetching repositories'
+    required: true
 runs:
   using: "composite"
   steps:
@@ -31,4 +38,4 @@ runs:
       run: ~/.bin/repo init -u ${{ inputs.manifest_url }} -b ${{ inputs.manifest_branch }} -m ${{ inputs.manifest_filename }}
     - name: Sync repos
       shell: bash
-      run: ~/.bin/repo sync
+      run: ~/.bin/repo sync -u ${{ inputs.username }} -p ${{ inputs.password }}