add alpha release action

Signed-off-by: dartcafe <github@dartcafe.de>

.github/workflows/publish_alpha.yml

@@ -0,0 +1,64 @@
+# SPDX-FileCopyrightText: 2022 Nextcloud contributors
+# SPDX-License-Identifier: AGPL-3.0-or-later
+name: Publish pre-release
+
+on: 
+  push:
+    tags:
+      - v*-alpha*
+
+jobs:
+  checkout:
+    runs-on: ubuntu-latest
+    name: Alpha release
+    steps:
+    - uses: actions/checkout@v4
+    - name: Check correct app version
+      id: appinfo
+      uses: ./.github/actions/get-polls-version
+
+    - name: Setup node
+      if: success()
+      uses: ./.github/actions/setup-node
+
+    - name: Setup composer and PHP
+      if: success()
+      uses: ./.github/actions/setup-composer
+      with:
+        mode: production
+        php-tools: composer
+
+    - name: build
+      run: npm run build --if-present
+
+    - name: Make appstore package ${{ steps.appinfo.outputs.app-version }}
+      if: success()
+      run: make package
+
+    - name: rename packages to polls-${{ steps.appinfo.outputs.app-version }}
+      if: success()
+      run: mv build/artifacts/appstore/polls.tar.gz build/artifacts/appstore/polls-${{ steps.appinfo.outputs.app-version }}.tar.gz
+
+    - name: create zip archive from sources
+      if: success()
+      run: |
+        pushd build/source
+        zip -r ../artifacts/appstore/polls-${{ steps.appinfo.outputs.app-version }}.zip *
+        popd
+
+    - name: Extract release notes
+      if: success()
+      id: extract-release-notes
+      uses: ffurrer2/extract-release-notes@v1
+
+    - name: Publish pre-release ${{ steps.appinfo.outputs.app-version }}
+      if: success()
+      uses: softprops/action-gh-release@v1
+      with:
+        body: "# Changelog for the upcomming release (preview)\n ${{ steps.extract-release-notes.outputs.release_notes }} "
+        prerelease: true
+        draft: false
+        generate_release_notes: true
+        files: |
+          build/artifacts/appstore/polls-${{ steps.appinfo.outputs.app-version }}.tar.gz
+          build/artifacts/appstore/polls-${{ steps.appinfo.outputs.app-version }}.zip