add create pre-release workflow

Author: mbektas

.github/workflows/prerelease.yml

@@ -0,0 +1,41 @@
+name: Create Pre-release
+
+on:
+  workflow_dispatch:
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+      
+      - name: Get package info
+        shell: bash
+        id: package-info
+        run: echo "version=$(python scripts/get_package_version.py)" >> $GITHUB_OUTPUT
+
+      - name: 'Find Release with tag v${{ steps.package-info.outputs.version}}'
+        uses: actions/github-script@v7
+        id: release-exists
+        env:
+          APP_VERSION: ${{ steps.package-info.outputs.version}}
+        with:
+          script: |
+            const releases = await github.rest.repos.listReleases({
+              owner: context.repo.owner,
+              repo: context.repo.repo
+            })
+            const tagName = `v${process.env.APP_VERSION}`
+            const releaseWithTag = releases.data.find(release => release.tag_name === tagName)
+            return releaseWithTag ? 'true' : 'false'
+          result-encoding: string
+
+      - name: Create pre-release
+        uses: softprops/action-gh-release@v1
+        if: steps.release-exists.outputs.result == 'false'
+        with:
+          body: '## JupyterLab Desktop v${{ steps.package-info.outputs.version}}'
+          draft: true
+          prerelease: true
+          tag_name: 'v${{ steps.package-info.outputs.version}}'