diff --git a/generator/render.py b/generator/render.py
index ba3a02f..0d3c14b 100644
--- a/generator/render.py
+++ b/generator/render.py
@@ -19,6 +19,7 @@ Usage:
 Every rendered file gets a "GENERATED by oleks/ci-scripts — do not hand-edit"
 header. Re-running is idempotent: same manifest in, byte-identical files out.
 """
+
 import argparse
 import pathlib
 import sys
@@ -58,7 +59,9 @@ def render_matrix(manifest: dict) -> dict:
         lines = "\n".join(f"          {k}: {v}" for k, v in node_selector.items())
         node_selector_block = f"        nodeSelector:\n{lines}\n"
         node_selector_top_block = (
-            "    backend_options:\n      kubernetes:\n        nodeSelector:\n" + lines + "\n"
+            "    backend_options:\n      kubernetes:\n        nodeSelector:\n"
+            + lines
+            + "\n"
         )
     else:
         node_selector_block = ""
@@ -180,7 +183,9 @@ def render_single(manifest: dict) -> dict:
     branches = "[" + ", ".join(manifest["branches"]) + "]"
     buildkit_addr = f"tcp://buildkit-{arch}.infra.svc.cluster.local:1234"
     header = manifest["header"].rstrip("\n") + "\n"
-    label_lines = _comment_block(manifest.get("label_comment", ""), "  ") + f"  arch: {arch}"
+    label_lines = (
+        _comment_block(manifest.get("label_comment", ""), "  ") + f"  arch: {arch}"
+    )
 
     step_tmpl = load_template("single", "COMPONENT_STEP.tmpl")
     steps = []
@@ -194,7 +199,9 @@ def render_single(manifest: dict) -> dict:
                 step_comment=step_comment,
                 step_name=c["name"],
                 image=manifest["image"],
-                buildkit_comment=_comment_block(c.get("buildkit_comment", ""), "      "),
+                buildkit_comment=_comment_block(
+                    c.get("buildkit_comment", ""), "      "
+                ),
                 buildkit_addr=buildkit_addr,
                 version_comment=_comment_block(c.get("version_comment", ""), "      "),
                 command=command,
@@ -218,8 +225,12 @@ RENDERERS = {"matrix": render_matrix, "split": render_split, "single": render_si
 def main():
     ap = argparse.ArgumentParser()
     ap.add_argument("manifest", type=pathlib.Path)
-    ap.add_argument("--out", type=pathlib.Path, required=True, help="target .woodpecker/ dir")
-    ap.add_argument("--check", action="store_true", help="don't write, just diff against --out")
+    ap.add_argument(
+        "--out", type=pathlib.Path, required=True, help="target .woodpecker/ dir"
+    )
+    ap.add_argument(
+        "--check", action="store_true", help="don't write, just diff against --out"
+    )
     args = ap.parse_args()
 
     manifest = yaml.safe_load(args.manifest.read_text())