pkgbuild: Add grok-bot-bin from official .deb

Temporary Arch/CachyOS packaging until upstream ships a native package.
Pulls Cursor's amd64 deb by commit from the linux-x64 update feed.
Includes update script and Gitea Actions for bump + makepkg release.

.gitea/workflows/update.yml

@@ -0,0 +1,29 @@
+name: Check for new release
+on:
+  schedule:
+    - cron: '17 6 * * *'
+  workflow_dispatch:
+
+jobs:
+  update:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - name: Bump PKGBUILD if a new version is out
+        run: |
+          set -euo pipefail
+          sudo apt-get update -qq
+          sudo apt-get install -y -qq jq curl
+          before=$(sed -n 's/^pkgver=//p' PKGBUILD)
+          ./scripts/update.sh
+          after=$(sed -n 's/^pkgver=//p' PKGBUILD)
+          if [[ "$before" == "$after" ]]; then
+            echo "No bump"
+            exit 0
+          fi
+          git config user.name 's1d3sw1ped_bot'
+          git config user.email 's1d3sw1ped_bot@git.s1d3sw1ped.com'
+          git add PKGBUILD .SRCINFO
+          git commit -m "pkgbuild: Bump grok-bot-bin to ${after}"
+          git tag "v${after}"
+          git push origin "HEAD:${GITHUB_REF_NAME}" "v${after}"