Try a fix for podman docker

Author: kinow

.readthedocs.yaml

@@ -6,10 +6,9 @@ build:
   os: ubuntu-22.04
   tools:
     python: "3.9"
+    nodejs: "16"
   apt_packages:
     - graphviz
-    - nodejs
-    - podman-docker
 
 sphinx:
   configuration: src/conf.py
@@ -21,4 +20,3 @@ python:
       path: .
       extra_requirements:
         - all
-

cwl/sphinx/runcmd.py

@@ -66,7 +66,9 @@ def run_command(command, working_directory):
         # For that reason, we define --disable-color in the CWLTOOL_OPTIONS
         # environment variable, which is used by ``cwltool``.
         env = os.environ
-        env['CWLTOOL_OPTIONS'] = '--disable-color'
+        cwl_options = set(env.get('CWLTOOL_OPTIONS', '').split(' '))
+        cwl_options.add('--disable-color')
+        env['CWLTOOL_OPTIONS'] = ' '.join(cwl_options)
         subp = subprocess.Popen(
             true_cmd,
             cwd=working_directory,

setup.cfg

@@ -49,6 +49,9 @@ test =
   cwltool==3.1.*
 watch =
   sphinx-autobuild==2021.3.*
+rtd =
+  udocker
 all =
   %(test)s
   %(watch)s
+  %(rtd)s