Merge pull request #42577 from tchaikov/wip-rtd

.readthedocs.yml: use python3.8 and native ditaa

Reviewed-by: Ernesto Puerta <epuertat@redhat.com>

.readthedocs.yml

@@ -6,8 +6,10 @@ version: 2
 formats: []
 build:
   image: latest
+  apt_packages:
+    - ditaa
 python:
-  version: 3
+  version: 3.8
   install:
     - requirements: admin/doc-requirements.txt
     - requirements: admin/doc-read-the-docs.txt

doc/conf.py

@@ -126,6 +126,9 @@ extensions = [
 
 ditaa = shutil.which("ditaa")
 if ditaa is not None:
+    # in case we don't have binfmt_misc enabled or jar is not registered
+    ditaa_args = ['-jar', ditaa]
+    ditaa = 'java'
     extensions += ['sphinxcontrib.ditaa']
 else:
     extensions += ['plantweb.directive']