meson: mark plugins cache target as always stale

diff --git a/docs/meson.build b/docs/meson.build
index 35a86d0..d06cce1 100644 (file)
--- a/docs/meson.build
+++ b/docs/meson.build
@@ -28,6 +28,7 @@ elif plugins_cache_generator.found()
         command: [plugins_cache_generator, plugins_cache, '@OUTPUT@', '@INPUT@'],
         input: plugins,
         output: 'gst_plugins_cache.json',
+        build_always_stale: true,
     )
 else
     warning('GStreamer plugin inspector for documentation not found, can\'t update the cache')