ci: print group section lines for GitHub workflow

Partially fixes: systemd#2361

tests/__init__.py

@@ -1,5 +1,6 @@
 # SPDX-License-Identifier: LGPL-2.1+
 
+import contextlib
 import os
 import subprocess
 import sys
@@ -163,3 +164,14 @@ def suspend_capture_stdin(pytestconfig: Any) -> Iterator[None]:
 
     if pytestconfig.getoption("capture") == "no":
         capmanager.resume_global_capture()
+
+
+@contextlib.contextmanager
+def ci_group(s: str) -> Iterator[None]:
+    if os.getenv("GITHUB_ACTIONS"):
+        print(f"\n::group::{s}", flush=True)
+    try:
+        yield
+    finally:
+        if os.getenv("GITHUB_ACTIONS"):
+            print("\n::endgroup::", flush=True)

tests/conftest.py

@@ -6,7 +6,7 @@
 from mkosi.config import parse_config
 from mkosi.distributions import Distribution, detect_distribution
 
-from . import Image
+from . import Image, ci_group
 
 
 def pytest_addoption(parser: Any) -> None:
@@ -50,3 +50,9 @@ def config(request: Any) -> Image.Config:
         tools_tree_distribution=cast(Distribution, request.config.getoption("--tools-tree-distribution")),
         debug_shell=request.config.getoption("--debug-shell"),
     )
+
+
+@pytest.fixture(autouse=True)
+def ci_sections(request: Any) -> Any:
+    with ci_group(request.node.name):
+        yield

tests/test_initrd.py

@@ -20,7 +20,7 @@
 from mkosi.user import INVOKING_USER
 from mkosi.versioncomp import GenericVersion
 
-from . import Image
+from . import Image, ci_group
 
 pytestmark = pytest.mark.integration
 
@@ -40,13 +40,16 @@ def passphrase() -> Iterator[Path]:
 
 @pytest.fixture(scope="module")
 def initrd(config: Image.Config) -> Iterator[Image]:
-    with Image(
-        config,
-        options=[
-            "--directory", "",
-            "--include=mkosi-initrd/",
-        ],
-    ) as initrd:
+    with (
+        ci_group(f"Initrd image {config.distribution}/{config.release}"),
+        Image(
+            config,
+            options=[
+                "--directory", "",
+                "--include=mkosi-initrd/",
+            ],
+        ) as initrd
+    ):
         if initrd.config.distribution == Distribution.rhel_ubi:
             pytest.skip("Cannot build RHEL-UBI initrds")