Creating a new Jekyll dev container leads to duplication in post create step

[tudortimi]

Does this issue occur when all extensions are disabled?: Yes

• VS Code Version: 1.73.1
• OS Version: CentOS 7

Steps to Reproduce:

1. Execute "Create Dev Container" command
2. Select Jekyll

The command will create a devcontainer.json with the following content:

// For format details, see https://aka.ms/devcontainer.json. For config options, see the
// README at: https://github.com/devcontainers/templates/tree/main/src/jekyll
{
	"name": "Jekyll",
	// Or use a Dockerfile or Docker Compose file. More info: https://containers.dev/guide/dockerfile
	"image": "mcr.microsoft.com/devcontainers/jekyll:0-bullseye",

	// 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": [
		// Jekyll server
		4000,
		// Live reload server
		35729
	],

	// Use 'postCreateCommand' to run commands after the container is created.
	"postCreateCommand": "sh .devcontainer/post-create.sh"

	// Configure tool-specific properties.
	// "customizations": {},

	// Uncomment to connect as root instead. More info: https://aka.ms/dev-containers-non-root.
	// "remoteUser": "root"
}

and a post-create.sh:

#!/bin/sh

# Install the version of Bundler.
if [ -f Gemfile.lock ] && grep "BUNDLED WITH" Gemfile.lock > /dev/null; then
    cat Gemfile.lock | tail -n 2 | grep -C2 "BUNDLED WITH" | tail -n 1 | xargs gem install bundler -v
fi

# If there's a Gemfile, then run `bundle install`
# It's assumed that the Gemfile will install Jekyll too
if [ -f Gemfile ]; then
    bundle install
fi

Newer versions of the Jekyll dev container already contain the settings for postCreateCommand (and in port forwarding) - the entry in the JSON and the script. The generated setup results in the bundler commands being executed twice.

[tudortimi]

Starting with version 0.1.9 of mcr.microsoft.com/devcontainers/jekyll, the dev container already contains the settings related to post-create.sh:

https://github.com/devcontainers/images/tree/v0.2.9/src/jekyll/.devcontainer

[tudortimi]

Version 0.1.9 of Jekyll is part of version 0.2.9 of the entire repo: https://github.com/devcontainers/images/blob/main/src/jekyll/history/0.1.9.md

[chrmarti]

Continuing in devcontainers/templates#118. Thanks.