Add nightly build

Author: stevencl840

.github/workflows/ci.yml

@@ -7,6 +7,14 @@ on:
       - '[0-9]+.[0-9]+.[0-9]+-*'
   pull_request:
   workflow_dispatch:
+    inputs:
+      nightly:
+        description: 'Build as nightly version'
+        required: false
+        type: boolean
+        default: false
+  schedule:
+    - cron: '0 15 * * *'  # Run at 3 PM UTC (1 AM Melbourne AEST / 2 AM AEDT)
 env:
   DOTNET_NOLOGO: true
 jobs:
@@ -24,6 +32,8 @@ jobs:
           dotnet-version: 9.0.x
       - name: Build
         run: dotnet build LibGit2Sharp.sln --configuration Release
+        env:
+          MinVerDefaultPreReleaseIdentifiers: ${{ (github.event_name == 'schedule' || inputs.nightly) && format('octopus-nightly-{0}', github.run_number) || 'octopus.0' }}
       - name: Upload packages
         uses: actions/upload-artifact@v4.3.1
         with: