ci: Install black for ansible-lint Jinja support

.gitlab-ci.yml

@@ -6,7 +6,7 @@ variables:
   GIT_SUBMODULE_STRATEGY: recursive
 
 before_script:
-  - apk --no-cache add ansible ansible-lint yamllint ripgrep
+  - apk --no-cache add ansible ansible-lint yamllint ripgrep black
   - export LANG=en_US.UTF-8
   - chmod o-w .
   - ansible --version