ci: add workflow for automatic palette updates (#13)

.github/workflows/palette.yml

@@ -0,0 +1,30 @@
+name: Palette
+
+on:
+  push:
+  workflow_dispatch:
+  schedule:
+    - cron: '0 0 * * *' # Run every day at midnight UTC
+
+jobs:
+  createPullRequest:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Make changes to pull request
+        run: curl -Lo src/palette.json 'https://raw.githubusercontent.com/catppuccin/palette/main/palette.json'
+
+      - name: Create Pull Request
+        id: cpr
+        uses: peter-evans/create-pull-request@v5
+        with:
+          commit-message: 'feat: auto-sync upstream palettes'
+          committer: GitHub <[email protected]>
+          author: ${{ github.actor }} <${{ github.actor }}@users.noreply.github.com>
+          signoff: false
+          branch: new-palettes
+          delete-branch: true
+          title: 'feat: auto-sync upstream palettes'
+          body: |
+            Auto-update `src/palette.json` based on https://github.com/catppuccin/palette/blob/main/palette.json