Add distinct_id input to add_mod_port workflow

See https://github.com/Codex-/return-dispatch

.github/workflows/add_mod_port.yml

@@ -23,6 +23,9 @@ on:
       file_id:
         description: "CurseForge file ID"
         required: true
+      distinct_id:
+        description: "Automatically set by the return-dispatch action (leave blank if running manually)"
+        required: false
 
 permissions:
   # To push the automated commit.
@@ -35,6 +38,9 @@ jobs:
     runs-on: ubuntu-latest
     steps:
 
+      - name: Echo distinct ID ${{ github.event.inputs.distinct_id }}
+        run: echo ${{ github.event.inputs.distinct_id }}
+
       - name: Checkout repository
         uses: actions/checkout@v4