Fix offscreen texture filter type, ignore one render test

metrics/ignores/linux-drawable.json

@@ -0,0 +1,3 @@
+{
+  "render-tests/regressions/mapbox-gl-js#3426": "https://github.com/maplibre/maplibre-native/issues/1734"
+}

metrics/linux-drawable.json

@@ -6,7 +6,8 @@
   ],
   "ignore_paths": [
       "ignores/platform-all.json",
-      "ignores/platform-linux.json"
+      "ignores/platform-linux.json",
+      "ignores/linux-drawable.json"
   ],
   "metric_path": "linux-gcc8-release",
   "probes": [

src/mbgl/gl/offscreen_texture.cpp

@@ -18,7 +18,7 @@ public:
         texture->setSize(size);
         texture->setFormat(gfx::TexturePixelType::RGBA, type);
         texture->setSamplerConfiguration(
-            {gfx::TextureFilterType::Nearest, gfx::TextureWrapType::Clamp, gfx::TextureWrapType::Clamp});
+            {gfx::TextureFilterType::Linear, gfx::TextureWrapType::Clamp, gfx::TextureWrapType::Clamp});
 #endif
     }