Added php configs as per the doc

nextcloud-syncthing-argocd-apps/templates/nextcloud-main-chart.yaml

@@ -61,6 +61,35 @@ spec:
             usernameKey: nc-admin-username
             passwordKey: nc-admin-password
           trustedDomains: {{ .Values.nextcloud.trustedDomains }}
+          nextcloud:
+            configs:
+              previews.config.php: |-
+                <?php
+                $CONFIG = array (
+                  'enable_previews' => true,
+                  'enabledPreviewProviders' => array (
+                    'OC\Preview\Movie',
+                    'OC\Preview\PNG',
+                    'OC\Preview\JPEG',
+                    'OC\Preview\GIF',
+                    'OC\Preview\BMP',
+                    'OC\Preview\XBitmap',
+                    'OC\Preview\MP3',
+                    'OC\Preview\MP4',
+                    'OC\Preview\TXT',
+                    'OC\Preview\MarkDown',
+                    'OC\Preview\PDF'
+                  ),
+                );
+              proxy.config.php: |-
+                <?php
+                $CONFIG = array (
+                  'trusted_proxies' => array(
+                    0 => '127.0.0.1',
+                    1 => '10.0.0.0/8',
+                  ),
+                  'forwarded_for_headers' => array('HTTP_X_FORWARDED_FOR'),
+                );
           # extraInitContainers - might be useful to make sure the LUKS secret is present
         # nginx:
         #   enabled: true