add missing descriptions

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

Author: dartcafe

.github/actions/get-polls-version/action.yml

@@ -1,6 +1,7 @@
 # SPDX-FileCopyrightText: 2022 Nextcloud contributors
 # SPDX-License-Identifier: AGPL-3.0-or-later
 name: Read polls version from info.xml
+description: 'Get app version from info.xml and compare it to tag name'
 inputs:
   skip-check:
     description: Do not check tag against version

.github/actions/setup-composer/action.yml

@@ -1,6 +1,7 @@
 # SPDX-FileCopyrightText: 2022 Nextcloud contributors
 # SPDX-License-Identifier: AGPL-3.0-or-later
 name: Setup composer and PHP
+description: 'Setup PHP environment and install composer dependencies with caching'
 inputs:
   php-version:
     description: 'PHP version (default: 8.2)'

.github/actions/setup-node/action.yml

@@ -1,6 +1,7 @@
 # SPDX-FileCopyrightText: 2022 Nextcloud contributors
 # SPDX-License-Identifier: AGPL-3.0-or-later
 name: Setup node and dependencies
+description: 'Setup node environment and install npm dependencies'
 inputs:
   node-version:
     required: false

.github/actions/setup-server/action.yml

@@ -1,6 +1,7 @@
 # SPDX-FileCopyrightText: 2022 Nextcloud contributors
 # SPDX-License-Identifier: AGPL-3.0-or-later
 name: Checkout and setup server
+description: 'Checkout Nextcloud server and app, setup PHP and install dependencies'
 inputs:
   server-version:
     required: false