Added docker compose to simulate GitHub pages

.gitignore

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+# Copied from https://github.com/github/gitignore/blob/main/Jekyll.gitignore
+# Ignore metadata generated by Jekyll
+_site/
+.sass-cache/
+.jekyll-cache/
+.jekyll-metadata
+
+# Ignore folders generated by Bundler
+.bundle/
+vendor/
+Gemfile.lock

Dockerfile

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+FROM ruby:2.7
+
+ENV LC_ALL C.UTF-8
+ENV LANG en_US.UTF-8
+ENV LANGUAGE en_US.UTF-8
+
+WORKDIR /usr/src/app
+
+COPY Gemfile ./
+RUN gem install bundler && bundle install
+
+EXPOSE 4000

Gemfile

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+source "https://rubygems.org"
+gem "github-pages", group: :jekyll_plugins
+gem "jekyll"
+gem "json"
+
+gem "webrick", group: :development

docker-compose.yml

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+version: "3.5"
+
+services:
+  jekyll:
+    build:
+      context: ./
+    ports:
+      - 4000:4000
+    volumes:
+      - ./:/usr/src/app
+    stdin_open: true
+    tty: true
+    command: bundle exec jekyll serve -H 0.0.0.0 -t --force_polling