Replace BUTR.NexusUploader upload with official Nexus-Mods/upload-action

- Switch file upload from BUTR.NexusUploader to Nexus-Mods/upload-action@v1.0.0-beta.2
- Add nexusmods_file_group_id input for the new upload action
- Keep BUTR.NexusUploader for changelog updates (not supported by new action)
- Remove NEXUSMODS_SESSION_COOKIE secret (no longer needed)
- Remove append_v_to_version input
- Modernize output syntax from ::set-output to $GITHUB_OUTPUT

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

.github/workflows/release-nexusmods.yml

@@ -9,17 +9,20 @@ on:
       nexusmods_mod_id:
         required: true
         type: string
+      nexusmods_file_group_id:
+        required: true
+        type: string
       mod_filename:
         required: true
         type: string
       mod_version:
         required: false
         type: string
-        default: ''
+        default: ""
       mod_description:
         required: false
         type: string
-        default: ''
+        default: ""
       artifact_name:
         required: true
         type: string
@@ -27,15 +30,9 @@ on:
         required: false
         type: boolean
         default: true
-      append_v_to_version:
-        required: false
-        type: boolean
-        default: true
     secrets:
       NEXUSMODS_APIKEY:
         required: true
-      NEXUSMODS_SESSION_COOKIE:
-        required: true
 
 jobs:
   publish-on-nexusmods:
@@ -45,12 +42,15 @@ jobs:
       name: NexusMods
       url: https://www.nexusmods.com/${{ inputs.nexusmods_game_id }}/mods/${{ inputs.nexusmods_mod_id }}
     steps:
-    
       - name: Setup
         uses: butr/actions-common-setup@v2
         with:
           github-token: ${{ secrets.GITHUB_TOKEN }}
 
+      - name: Install BUTR.NexusUploader
+        run: dotnet tool install -g BUTR.NexusUploader;
+        shell: pwsh
+
       - name: Download Module artifact
         uses: actions/download-artifact@v4
         with:
@@ -68,8 +68,6 @@ jobs:
 
       - name: 7z Module
         run: 7z a -t7z "${{ inputs.mod_filename }}.7z" ./artifact/* -mx9
-      #shell: pwsh
-      # pwsh casues it to include the root folder
 
       - name: Install Bannerlord.ChangelogParser
         if: ${{ inputs.mod_description == '' }}
@@ -82,9 +80,9 @@ jobs:
           if ${{ inputs.mod_version == '' }}
           then
             vers="$(bannerlord_changelog_parser latestversion -f "$PWD/changelog.txt")"
-          echo "::set-output name=mod_version::$vers"
+            echo "mod_version=$vers" >> "$GITHUB_OUTPUT"
           else
-          echo "::set-output name=mod_version::${{ inputs.mod_version }}"
+            echo "mod_version=${{ inputs.mod_version }}" >> "$GITHUB_OUTPUT"
           fi
 
       - name: Set Description
@@ -93,39 +91,35 @@ jobs:
           if ${{ inputs.mod_description == '' }}
           then
             desc="$(bannerlord_changelog_parser ${{ inputs.mod_description_full && 'fulldescription' || 'description' }} -f "$PWD/changelog.txt")"
-          desc="${desc//'%'/'%25'}"
-          desc="${desc//$'"'/'%22'}"
-          desc="${desc//$'\n'/'%0A'}"
-          desc="${desc//$'\r'/'%0D'}"
-          echo "::set-output name=mod_description::$desc"
-          c_desc="${desc#'For'*'%0A* '}"
-          c_desc="${c_desc//'%0A* '/'%0A'}"
-          echo "::set-output name=mod_changelog::$c_desc"
           else
             desc="${{ inputs.mod_description }}"
-          desc="${desc//'%'/'%25'}"
-          desc="${desc//$'"'/'%22'}"
-          desc="${desc//$'\n'/'%0A'}"
-          desc="${desc//$'\r'/'%0D'}"
-          echo "::set-output name=mod_description::$desc"
-          c_desc="${desc#'For'*'%0A* '}"
-          c_desc="${c_desc//'%0A* '/'%0A'}"
-          echo "::set-output name=mod_changelog::$c_desc"          
           fi
+          echo "mod_description<<EOF" >> "$GITHUB_OUTPUT"
+          echo "$desc" >> "$GITHUB_OUTPUT"
+          echo "EOF" >> "$GITHUB_OUTPUT"
+          c_desc="${desc#'For'*$'\n'* }"
+          c_desc="${c_desc//$'\n'* /$'\n'}"
+          echo "mod_changelog<<EOF" >> "$GITHUB_OUTPUT"
+          echo "$c_desc" >> "$GITHUB_OUTPUT"
+          echo "EOF" >> "$GITHUB_OUTPUT"
 
-    - name: Install BUTR.NexusUploader
+      - name: Upload to NexusMods
-      run: dotnet tool install -g BUTR.NexusUploader;
+        uses: Nexus-Mods/upload-action@v1.0.0-beta.2
-      shell: pwsh
+        with:
+          api_key: ${{ secrets.NEXUSMODS_APIKEY }}
+          file_group_id: ${{ inputs.nexusmods_file_group_id }}
+          filename: ${{ inputs.mod_filename }}.7z
+          version: ${{ steps.set_version.outputs.mod_version }}
+          display_name: ${{ inputs.mod_filename }}
+          description: ${{ steps.set_description.outputs.mod_description }}
+          file_category: main
 
-    - name: Run BUTR.NexusUploader
+      - name: Update NexusMods Changelog
-      run: |
+        run: >-
-        unex upload ${{ inputs.nexusmods_mod_id }} "${{ inputs.mod_filename }}.7z" -v "${{ inputs.append_v_to_version && 'v' || '' }}${{ steps.set_version.outputs.mod_version }}" -f "${{ inputs.mod_filename }}";
+          unex changelog "${{ steps.set_version.outputs.mod_version }}"
-        unex changelog "${{ inputs.append_v_to_version && 'v' || '' }}${{ steps.set_version.outputs.mod_version }}" -c "${{ steps.set_description.outputs.mod_changelog }}" -m "${{ inputs.nexusmods_mod_id }}";
+          -c "${{ steps.set_description.outputs.mod_changelog }}"
+          -m "${{ inputs.nexusmods_mod_id }}";
         shell: pwsh
         env:
           UNEX_GAME: ${{ inputs.nexusmods_game_id }}
-        UNEX_FILEDESCRIPTION: ${{ steps.set_description.outputs.mod_description }}
-        UNEX_PREVIOUSFILE: auto
           UNEX_APIKEY: ${{ secrets.NEXUSMODS_APIKEY }}
-        UNEX_SESSION_COOKIE: ${{ secrets.NEXUSMODS_SESSION_COOKIE }}
-        UNEX_DEBUG: true