Add devcontainers to the project

.devcontainer/Dockerfile

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+ARG DEBIAN_FRONTEND=noninteractive
+ARG VARIANT=bullseye
+
+FROM mcr.microsoft.com/vscode/devcontainers/base:${VARIANT}
+
+RUN apt-get update && \
+    apt-get -y install --no-install-recommends \
+    build-essential gnupg2 tar git zsh libssl-dev zlib1g-dev libyaml-dev curl libreadline-dev \
+    postgresql-client libpq-dev \
+    imagemagick libjpeg-dev libpng-dev libtiff-dev libwebp-dev libvips \
+    tzdata \
+    tmux \
+    vim
+
+# Install rbenv and ruby
+USER vscode
+
+ARG RUBY_VERSION="2.6.8"
+RUN git clone https://github.com/rbenv/rbenv.git /home/vscode/.rbenv  \
+    && echo '[ -f "/home/vscode/.rbenv/bin/rbenv" ] && eval "$(rbenv init - bash)" # rbenv' >> /home/vscode/.zshrc \
+    && echo '[ -f "/home/vscode/.rbenv/bin/rbenv" ] && eval "$(rbenv init - bash)" # rbenv' >> /home/vscode/.bashrc \
+    && echo 'export PATH="/home/vscode/.rbenv/bin:$PATH"' >> /home/vscode/.zshrc \
+    && echo 'export PATH="/home/vscode/.rbenv/bin:$PATH"' >> /home/vscode/.bashrc \
+    && mkdir -p /home/vscode/.rbenv/versions \
+    && mkdir -p /home/vscode/.rbenv/plugins \
+    && git clone https://github.com/rbenv/ruby-build.git /home/vscode/.rbenv/plugins/ruby-build
+
+ENV PATH "/home/vscode/.rbenv/bin/:HOME/.rbenv/shims/:$PATH"
+
+RUN rbenv install $RUBY_VERSION && \
+    rbenv global $RUBY_VERSION && \
+    rbenv versions
+
+COPY .devcontainer/welcome.txt /usr/local/etc/vscode-dev-containers/first-run-notice.txt

.devcontainer/devcontainer.json

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+// For format details, see https://aka.ms/devcontainer.json. For config options, see the
+// README at: https://github.com/devcontainers/templates/tree/main/src/ruby-rails-postgres
+{
+    "name": "Blog DevContainer",
+    "build": {
+        "dockerfile": "Dockerfile",
+        "context": ".."
+    },
+    "workspaceFolder": "/workspaces/${localWorkspaceFolderBasename}",
+    "features": {
+        "ghcr.io/devcontainers/features/node:1": {
+            "version": "9"
+        }
+    },
+    "remoteEnv": {
+        "GIT_EDITOR": "code --wait"
+    },
+    "onCreateCommand": ".devcontainer/onCreateCommand.sh",
+    "customizations": {
+        "vscode": {
+            // Set *default* container specific settings.json values on container create.
+            "extensions": [
+                "GitHub.github-vscode-theme",
+                "eamodio.gitlens",
+            ],
+            "rubyLsp.enableExperimentalFeatures": true
+        }
+    },
+    // Use 'forwardPorts' to make a list of ports inside the container available locally.
+    "forwardPorts": [
+        4000
+    ],
+    "portsAttributes": {
+        "4000": {
+            "label": "web",
+            "onAutoForward": "notify",
+            "requireLocalPort": true
+        }
+    }
+}

.devcontainer/onCreateCommand.sh

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+#!/usr/bin/env bash
+
+echo "Updating RubyGems..."
+gem update --system -N
+
+echo "Installing dependencies..."
+bundle
+
+echo "Done!"

.devcontainer/welcome.txt

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+👋 Welcome to "Blog"!
+
+🛠️  Your environment is fully setup with all the required software.
+

.ruby-version

@@ -1 +1 @@
-2.4.5
+2.6.8

.tool-versions

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+ruby 2.6.8

bin/dev

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+#!/usr/bin/env sh
+
+exec bundle exec jekyll serve --config _config.yml,_config-dev.yml