ci: add signed release workflow (#440)

Signed-off-by: Thomas Müller <1005065+DeepDiver1975@users.noreply.github.com>

Author: DeepDiver1975

.github/workflows/release.yml

@@ -0,0 +1,22 @@
+name: Release
+
+on:
+  push:
+    tags:
+      - 'v*'
+
+permissions:
+  contents: read
+
+jobs:
+  release:
+    permissions:
+      contents: write
+    uses: owncloud/reusable-workflows/.github/workflows/release.yml@main
+    with:
+      app-name: files_texteditor
+      artifact-glob: build/artifacts/appstore/files_texteditor.tar.gz
+    secrets:
+      SIGNING_KEY: ${{ secrets.SIGNING_KEY }}
+      SIGNING_CERT: ${{ secrets.SIGNING_CERT }}
+      SIGNING_CHAIN: ${{ secrets.SIGNING_CHAIN }}