Merge pull request #2802 from yahonda/devcontainer-spec-format

Use documentation formatter for rspec in devcontainer CI

Author: yahonda

.github/workflows/devcontainer.yml

@@ -25,5 +25,5 @@ jobs:
             uname -a
             lsb_release -a
             ruby --version
-            bundle exec rake spec
+            SPEC_OPTS="--format documentation" bundle exec rake spec
             bundle exec rubocop