add docker image

.devcontainer/devcontainer.json

@@ -0,0 +1,26 @@
+// For format details, see https://aka.ms/devcontainer.json. For config options, see the
+// README at: https://github.com/devcontainers/templates/tree/main/src/docker-existing-dockerfile
+{
+	"name": "Textbook Development",
+	"build": {
+		// Sets the run context to one level up instead of the .devcontainer folder.
+		// Update the 'dockerFile' property if you aren't using the standard 'Dockerfile' filename.
+		"context": "..",
+		"dockerfile": "../Dockerfile.devel"
+	},
+
+	// Features to add to the dev container. More info: https://containers.dev/features.
+	// "features": {},
+
+	// Use 'forwardPorts' to make a list of ports inside the container available locally.
+	"forwardPorts": [4000],
+
+	// Uncomment the next line to run commands after the container is created.
+	"postCreateCommand": "cat /etc/os-release"
+
+	// Configure tool-specific properties.
+	// "customizations": {},
+
+	// Uncomment to connect as an existing user other than the container default. More info: https://aka.ms/dev-containers-non-root.
+	// "remoteUser": "devcontainer"
+}

.github/dependabot.yml

@@ -0,0 +1,12 @@
+# To get started with Dependabot version updates, you'll need to specify which
+# package ecosystems to update and where the package manifests are located.
+# Please see the documentation for more information:
+# https://docs.github.com/github/administering-a-repository/configuration-options-for-dependency-updates
+# https://containers.dev/guide/dependabot
+
+version: 2
+updates:
+ - package-ecosystem: "devcontainers"
+   directory: "/"
+   schedule:
+     interval: weekly

Dockerfile.devel

@@ -0,0 +1,22 @@
+FROM ruby:2.7.7
+ENV NODE_VERSION=20.11.0
+RUN apt update && apt install -y curl build-essential
+RUN curl -o- https://raw.githubusercontent.com/nvm-sh/nvm/v0.39.7/install.sh | bash
+ENV NVM_DIR=/root/.nvm
+RUN . "$NVM_DIR/nvm.sh" && nvm install ${NODE_VERSION}
+RUN . "$NVM_DIR/nvm.sh" && nvm use v${NODE_VERSION}
+RUN . "$NVM_DIR/nvm.sh" && nvm alias default v${NODE_VERSION}
+ENV PATH="/root/.nvm/versions/node/v${NODE_VERSION}/bin/:${PATH}"
+RUN gem install bundler:2.3.7
+COPY Gemfile .
+COPY Gemfile.lock .
+COPY Makefile .
+
+RUN mkdir cs357-rtd-theme
+COPY cs357-rtd-theme/package.json cs357-rtd-theme/
+COPY cs357-rtd-theme/yarn.lock cs357-rtd-theme/
+COPY cs357-rtd-theme/Gemfile cs357-rtd-theme/
+COPY cs357-rtd-theme/jekyll-rtd-theme.gemspec cs357-rtd-theme/
+COPY cs357-rtd-theme/Makefile cs357-rtd-theme/
+
+RUN make install

Gemfile.lock

@@ -212,11 +212,15 @@ GEM
       rb-fsevent (~> 0.10, >= 0.10.3)
       rb-inotify (~> 0.9, >= 0.9.10)
     mercenary (0.3.6)
+    mini_portile2 (2.8.5)
     minima (2.5.1)
       jekyll (>= 3.5, < 5.0)
       jekyll-feed (~> 0.9)
       jekyll-seo-tag (~> 2.1)
     minitest (5.21.2)
+    nokogiri (1.13.10)
+      mini_portile2 (~> 2.8.0)
+      racc (~> 1.4)
     nokogiri (1.13.10-arm64-darwin)
       racc (~> 1.4)
     nokogiri (1.13.10-x86_64-linux)
@@ -263,6 +267,7 @@ GEM
     zeitwerk (2.6.12)
 
 PLATFORMS
+  ruby
   universal-darwin-23
   x86_64-linux