Clarify OpenSSL trust store override and clean up code

Added a comment to clarify the purpose of the OpenSSL trust store override and removed unnecessary code related to GDK_BACKEND configuration.

.github/workflows/appimage-build.yml

@@ -99,21 +99,11 @@ jobs:
             export GIO_EXTRA_MODULES="$APPDIR/usr/lib/gio/modules${GIO_EXTRA_MODULES:+:$GIO_EXTRA_MODULES}"
           fi
 
-          # OpenSSL trust store override
+          # OpenSSL trust store override (fixes “unable to get local issuer certificate (20)”)
           export SSL_CERT_FILE="${SSL_CERT_FILE:-$APPDIR/etc/ssl/certs/ca-certificates.crt}"
           export SSL_CERT_DIR="${SSL_CERT_DIR:-$APPDIR/etc/ssl/certs}"
           export CURL_CA_BUNDLE="${CURL_CA_BUNDLE:-$SSL_CERT_FILE}"
 
-          # Prefer Wayland if the session provides it, but keep X11 fallback.
-          # Don't override if the user already set GDK_BACKEND explicitly.
-          if [ -z "${GDK_BACKEND:-}" ]; then
-            if [ -n "${WAYLAND_DISPLAY:-}" ] || [ "${XDG_SESSION_TYPE:-}" = "wayland" ]; then
-              export GDK_BACKEND="wayland,x11"
-            else
-              export GDK_BACKEND="x11"
-            fi
-          fi
-
           exec "$APPDIR/usr/bin/zoitechat" "$@"
           EOF
           chmod +x AppRun