Create sdk-unstable-branch.yaml (#24)

.github/workflows/sdk-unstable-branch.yaml

@@ -0,0 +1,46 @@
+name: Generate Unstable Branch
+
+on:
+  schedule:
+    - cron: '0 0 * * *'
+  workflow_dispatch:
+  push:
+    branches:
+      - master
+
+concurrency:
+  group: unstable-branch
+
+jobs:
+  build:
+    runs-on: macos-latest
+    if: ${{ github.repository == 'jellyfin/jellyfin-sdk-swift' }}
+    steps:
+    - name: Check out Git repository
+      uses: actions/checkout@v4
+      with:
+        ref: main
+        token: ${{ secrets.JF_BOT_TOKEN }}
+    
+    - name: Download unstable OpenAPI schema
+      run: |
+        curl -sL https://repo.jellyfin.org/releases/openapi/jellyfin-openapi-unstable.json -o jellyfin-openapi-stable.json
+        cp -rf jellyfin-openapi-stable.json $GITHUB_WORKSPACE/Sources
+
+    - name: Generate API
+      run: |
+        cd $GITHUB_WORKSPACE
+        swift package --allow-writing-to-package-directory generate-api
+
+    - name: Build
+      run: |
+        swift build
+
+    - name: Commit changes
+      run: |
+        git config user.name jellyfin-bot
+        git config user.email team@jellyfin.org
+        git checkout -B openapi-unstable
+        git add .
+        git commit --allow-empty -m "Update OpenAPI to unstable"
+        git push --force origin openapi-unstable