Enlarge the matrix

Author: aitap

.github/workflows/R-CMD-check-occasional.yaml

@@ -17,8 +17,8 @@ jobs:
       fail-fast: false
       matrix:
         os: [ubuntu-latest]
-        r: ['3.5']
-        locale: [ 'ru_RU.KOI8-R' ]
+        r: ['3.5','release','devel']
+        locale: [ 'ru_RU.KOI8-R','zh_CN.GB18030' ]
         # we're constrained by GHA inflexibility to do a tedious thing here with 'exclude' below.
         #   better would be for GHA to support multiple 'matrix' configs (one for ubuntu, one for other OS);
         #   an approach with multiple jobs would tediously require copy-pasting the _rest_ of the steps