[ci] Do not print docker instructions if on macOS

.github/workflows/root-ci-config/build_root.py

@@ -33,7 +33,8 @@
     calc_options_hash,
     subprocess_with_log,
     subprocess_with_capture,
-    upload_file
+    upload_file,
+    is_macos
 )
 import build_utils
 
@@ -92,7 +93,7 @@ def main():
     # Differentiate between macos versions: it's possible to have the same label
     # for different macos versions, especially different minor versions.
     macos_version_prefix = ''
-    if 'Darwin' == platform.system():
+    if is_macos():
         macos_version_tuple = platform.mac_ver()
         macos_version = macos_version_tuple[0]
         macos_version_prefix = f'{macos_version}/'

.github/workflows/root-ci-config/build_utils.py

@@ -7,6 +7,7 @@
 import textwrap
 import datetime
 import time
+import platform
 from functools import wraps
 from hashlib import sha1
 from http import HTTPStatus
@@ -17,6 +18,9 @@
 from openstack.connection import Connection
 from requests import get
 
+def is_macos():
+    return 'Darwin' == platform.system()
+
 class SimpleTimer:
     def __init__(self):
         self._start_time = time.perf_counter()
@@ -72,7 +76,7 @@ def add(self, command: str) -> None:
     @github_log_group("To replicate this build locally")
     def print(self) -> None:
         if self.trace != "":
-            if self.image:
+            if self.image and not is_macos():
                 print(f"""\
 # Grab the image and set up the python virtual environment:
 docker run {' '.join(self.docker_opts)} -it registry.cern.ch/root-ci/{self.image}:buildready