Create devcontainer configuration (#6479)

* Add basic devcontainer config

* Use Dockerfile for devcontainer

This is to install additional dependencies that don't come with base
image.

* Fetch test references

These references are necessary for tests to work properly.

* Depluralize

* Add YAML VSCode extension

Most peeps will be editing the YAML files so lets ensure a better experience

* Move bootstrap to onCreateCommand

This will allow the bootstrapping to be cached in the prebuild and save users a lot of time

* Make arrays multi-line

Co-authored-by: John Gardner <gardnerjohng@gmail.com>

---------

Co-authored-by: Colin Seymour <colin@symr.io>
Co-authored-by: Colin Seymour <colin@github.com>
Co-authored-by: John Gardner <gardnerjohng@gmail.com>

.devcontainer/Dockerfile

@@ -0,0 +1,3 @@
+# Available versions: https://github.com/devcontainers/images/tree/main/src/ruby
+FROM mcr.microsoft.com/devcontainers/ruby
+RUN apt update && apt install -y cmake

.devcontainer/devcontainer.json

@@ -0,0 +1,28 @@
+{
+  "name": "Ruby",
+  "build": {
+    "dockerfile": "Dockerfile"
+  },
+  "features": {
+    "ghcr.io/devcontainers/features/docker-in-docker:2": {},
+    "ghcr.io/devcontainers/features/go:1": {}
+  },
+  "customizations": {
+    "codespaces": {
+      "openFiles": [
+        "CONTRIBUTING.md",
+        "lib/linguist/languages.yml"
+      ]
+    },
+    "vscode": {
+      "extensions": [
+        "EditorConfig.EditorConfig",
+        "rebornix.Ruby",
+        "redhat.vscode-yaml"
+      ]
+    }
+  },
+  "onCreateCommand": "./script/bootstrap",
+  "postCreateCommand": ".devcontainer/postCreate.sh",
+  "remoteUser": "vscode"
+}

.devcontainer/postCreate.sh

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+#!/bin/sh
+git remote add linguist https://github.com/github-linguist/linguist
+git fetch linguist v2.0.0:v2.0.0 test/attributes:test/attributes test/master:test/master

.gitattributes

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+# Fix syntax highlighting for devcontainer files
+.devcontainer/*.json linguist-language=JSON-with-Comments