markdownlint-cli2, pin bundler, drop node 16, add node 21 (#8)

* Add markdownlint-cli2

* Pin bundler version

* Update Dockerfile

* Update Dockerfile

* Update README.md

* Update build.yml

.github/workflows/build.yml

@@ -16,7 +16,7 @@ jobs:
     strategy:
       matrix:
         VERSIONS: [ {ruby: 2.7.3, ghpages: 226}, {ruby: 2.7.4, ghpages: 228}]
-        NODE_MAJOR_VERSION: [16,18,20]
+        NODE_MAJOR_VERSION: [18,20,21]
     runs-on: ubuntu-latest
     env:
       RUBY_VERSION: ${{ matrix.VERSIONS.ruby }}

Dockerfile

@@ -11,8 +11,11 @@ ARG BUILD_DATE
 ARG VCS_REF
 ARG GH_PAGES_VERSION=228
 ARG NODE_MAJOR_VERSION=18
+# Bundler 2.4.x is the last to support ruby < 3.0.0
+ARG BUNDLER_VERSION=2.4.22
 
 RUN echo "RUBY_VERSION=${RUBY_VERSION}"
+RUN echo "BUNDLER_VERSION=${BUNDLER_VERSION}"
 RUN echo "BUILD_DATE=${BUILD_DATE}"
 RUN echo "VCS_REF=${VCS_REF}"
 RUN echo "GH_PAGES_VERSION=${GH_PAGES_VERSION}"
@@ -48,7 +51,7 @@ RUN apt-get -y install \
     tzdata \
     dos2unix
 
-RUN gem install bundler
+RUN gem install bundler -v ${BUNDLER_VERSION}
 
 #################################################################
 #                  Installing node                              #
@@ -66,5 +69,6 @@ RUN curl -sL https://deb.nodesource.com/setup_${NODE_MAJOR_VERSION}.x | bash -\
 RUN node -v
 RUN npm -v
 RUN npm install -g cspell markdownlint-cli
+RUN npm install -g markdownlint-cli2
 
-EXPOSE 4000
+EXPOSE 4000

README.md

@@ -11,7 +11,10 @@ We try to keep it up to date with [the GitHub Pages dependencies](https://pages.
 * Ruby, at the specified version (currently publish with 2.7.3 to match GitHub pages preferred version)
 * Git, tzdata updates, and the latest `bundler` gem at the time of build
 * Node at the specified major version (currently 16.x)
-* the `cSpell` and `markdownlint-cli` npm packages globally installed
+* the following npm packages globally installed:
+  * `cSpell`
+  * `markdownlint-cli`
+  * `markdownlint-cli2`
 * Port 4000 exposed, as this is what Jekyll publishes on.
 
 ## Get Involved