ci(actions): create github release for arm64 binaries

This commit adds a 'Create GitHub Release' step using the GitHub CLI (gh release create) to the build-arm64 workflow. It also grants 'contents: write' permissions to the job so it can publish the generated Linux ARM64 binaries as a GitHub release associated with the dynamically calculated fork version.

.github/workflows/build-arm64.yml

@@ -11,6 +11,8 @@ jobs:
   build-arm64:
     name: Build Linux ARM64
     runs-on: ubuntu-latest
+    permissions:
+      contents: write
     steps:
       - name: 📢 Notify Start
         run: |
@@ -72,6 +74,14 @@ jobs:
           path: dist/*linux_arm64*/picoclaw*
           if-no-files-found: warn
 
+      - name: Create GitHub Release
+        env:
+          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        run: |
+          gh release create "${{ env.FORK_VERSION }}" dist/*linux_arm64*/picoclaw* \
+            --title "Fork Build ${{ env.FORK_VERSION }}" \
+            --notes "Automated release from branch ${{ github.ref_name }}."
+
       - name: 📢 Notify Success
         if: success()
         run: |