ci: check kernel codestyle on change

.gitea/workflows/build.yaml

@@ -9,18 +9,6 @@ on:
       - 'main'
 
 jobs:
-  codestyle:
-    name: "Check kernel codestyle"
-    runs-on: kolibri-toolchain
-
-    steps:
-      - name: Checkout
-        uses: actions/checkout@v4
-
-      - name: Check codestyle
-        run: |
-          find kernel/trunk -iname '*.asm' -or -iname '*.inc' -exec bash -c "echo {}; cat {} | perl .gitea/workflows/checker.pl" \;
-
   build:
     name: 'Build'
     runs-on: kolibri-toolchain
@@ -131,7 +119,7 @@ jobs:
           echo "CONFIG_LANG=ru_RU"       >> ru_RU.config
           echo "CONFIG_BUILD_TYPE=ru_RU" >> ru_RU.config
           tup variant ru_RU.config
-          
+
           # Configure es_ES
           echo "CONFIG_LANG=es_ES"       >> es_ES.config
           echo "CONFIG_BUILD_TYPE=es_ES" >> es_ES.config

.gitea/workflows/kernel-check.yaml

@@ -0,0 +1,25 @@
+# SPDX-License-Identifier: GPL-2.0-only
+# SPDX-FileCopyrightText: 2025 KolibriOS team
+
+name: 'Check kernel codestyle'
+
+on:
+  pull_request:
+    branches:
+      - 'main'
+    paths:
+      - 'kernel/trunc/**'
+
+jobs:
+  codestyle:
+    name: "Check kernel codestyle"
+    runs-on: kolibri-toolchain
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+        sparse-checkout: 'kernel/trunc/**'
+
+      - name: Check codestyle
+        run: |
+          find kernel/trunk -iname '*.asm' -or -iname '*.inc' -exec bash -c "echo {}; cat {} | perl .gitea/workflows/checker.pl" \;