[build] Be a bit more verbose about channel usage during builds

bob/devtools/build.py

@@ -293,6 +293,8 @@ if __name__ == '__main__':
   channels = bootstrap.get_channels(
       public=(os.environ['CI_PROJECT_VISIBILITY']=='public'),
       stable=(not is_prerelease), server=bootstrap._SERVER, intranet=True)
+  logger.info('Using the following channels during build:%s',
+      '\n  - '.join(channels))
   condarc_options['channels'] = channels + ['defaults']
 
   conda_config = make_conda_config(conda_build_config, pyver, recipe_append,

bob/devtools/scripts/build.py

@@ -100,6 +100,8 @@ def build(recipe_dir, python, condarc, config, no_test, append_file,
   else:
     # use default and add channels
     condarc_options = yaml.load(BASE_CONDARC)  #n.b.: no channels
+    logger.info('Using the following channels during build:%s',
+        '\n  - '.join(channels))
     condarc_options['channels'] = channels + ['defaults']
 
   conda_config = make_conda_config(config, python, append_file, condarc_options)