Install BASH to enable and support globstar (**) (#6)

CHANGELOG.md

@@ -4,6 +4,14 @@ All notable changes to this project will be documented in this file.
 
 The format is based on [Keep a Changelog][keepachangelog] and this project adheres to [Semantic Versioning][semver].
 
+## v1.2.0 - 2020-06-19
+
+### Added
+
+- Support for globstar (`**`) by changing the shell to bash [#6]
+
+[#6]:https://github.com/avto-dev/markdown-lint/pull/6
+
 ## v1.2.0 - 2020-05-28
 
 ### Added

Dockerfile

@@ -8,6 +8,7 @@ LABEL \
   org.label-schema.vendor="avto-dev" \
   org.label-schema.vcs-url="https://github.com/avto-dev/markdown-lint"
 
+RUN apk add --no-cache bash
 RUN set -x \
   # package page: <https://github.com/igorshubovych/markdownlint-cli>
   && npm install -g markdownlint-cli \

docker-entrypoint.sh

@@ -1,4 +1,5 @@
-#!/bin/sh
+#!/bin/bash
+shopt -s globstar
 
 RUN_ARGS="";