Hide Sieve form section when managesieve plugin is not active

Add GitHub Actions workflows for PHP CodeSniffer and PHP Lint (8.2/8.3/8.4).

.github/workflows/php-lint.yml

@@ -0,0 +1,24 @@
+name: PHP Lint
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+    branches: [main]
+
+jobs:
+  lint:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        php-version: ['8.2', '8.3', '8.4']
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Setup PHP ${{ matrix.php-version }}
+        uses: shivammathur/setup-php@v2
+        with:
+          php-version: ${{ matrix.php-version }}
+
+      - name: Lint PHP files
+        run: find . -name '*.php' -not -path './vendor/*' -exec php -l {} + | (! grep -v "No syntax errors")

.github/workflows/phpcs.yml

@@ -0,0 +1,25 @@
+name: PHP CodeSniffer
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+    branches: [main]
+
+jobs:
+  phpcs:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Setup PHP
+        uses: shivammathur/setup-php@v2
+        with:
+          php-version: '8.2'
+          tools: composer
+
+      - name: Install dependencies
+        run: composer config allow-plugins.roundcube/plugin-installer true && composer install --prefer-dist --no-progress
+
+      - name: Run PHP CodeSniffer
+        run: composer phpcs

lib/IdentSwitchForm.php

@@ -713,10 +713,12 @@ class IdentSwitchForm
             'name' => $this->plugin->gettext('form.smtp.caption'),
             'content' => $this->get_smtp_fields($record),
         ];
+        if ($rc->plugins->get_plugin('managesieve')) {
             $args['form']['ident_switch.sieve'] = [
                 'name' => $this->plugin->gettext('form.sieve.caption'),
                 'content' => $this->get_sieve_fields($record),
             ];
+        }
         if (!$rc->config->get('ident_switch.check_mail', true)) {
             // Admin disabled background mail checking
         } elseif ($rc->plugins->get_plugin('newmail_notifier')) {