chore: setup devcontainer for CLI contributions (#6905)

# Description

- This PR adds a new devconatiner configuration with the basic setup to
contribute to the radius project esp. the CLI. It contains the necessary
tools to allow a quick starting point for contributions and bug analysis
and fixing. This complements the setup already available for the
tutorials
- In order to make the debug experience easier, a launch configuration
was added to enable a direct entry into the CLI commands

## Type of change

- This pull request is a minor refactor, code cleanup, test improvement,
or other maintenance task and doesn't change the functionality of
Radius.

Fixes: #6904

## Auto-generated summary

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### Summary
🐳🛠️🐛

<!--
1. 🐳 - This emoji represents the use of Docker and devcontainers, as
well as the docker-in-docker feature that allows the devcontainer to run
minikube and other docker commands.
2. 🛠️ - This emoji represents the installation of various tools and
features that enhance the development and testing experience, such as
Go, golangci-lint, git, GitHub CLI, kubectl, helm, and minikube.
3. 🐛 - This emoji represents the ability to debug the Radius CLI using
the Go debugger and the VS Code settings that enable this feature.
-->
This pull request adds new VS Code and devcontainer settings to improve
the development and debugging experience for the Radius CLI project. It
allows contributors to run and debug the `radius` command with different
arguments, and to use various tools and features in a consistent and
isolated environment.

> _We are the coders of the Radius CLI_
> _We build and debug with Go and VS Code_
> _We unleash the power of devcontainer_
> _We run `init --full` to start the adventure_

### Walkthrough
* Add a devcontainer configuration for contributors
([link](https://github.com/radius-project/radius/pull/6905/files?diff=unified&w=0#diff-935f2b2e55e0ab1017fd1c544b9191e499e90e473ece926f8e65e95ddfbb1b1eL1-R30))
* Add a launch configuration for debugging the Radius CLI
([link](https://github.com/radius-project/radius/pull/6905/files?diff=unified&w=0#diff-bd5430ee7c51dc892a67b3f2829d1f5b6d223f0fd48b82322cfd45baf9f5e945R8-R16),
[link](https://github.com/radius-project/radius/pull/6905/files?diff=unified&w=0#diff-bd5430ee7c51dc892a67b3f2829d1f5b6d223f0fd48b82322cfd45baf9f5e945L92-R107))

---------

Signed-off-by: Christian Lechner <[email protected]>

.devcontainer/contributor/devcontainer.json

@@ -0,0 +1,26 @@
+{
+    "name": "Radius - Contributor",
+    "image": "mcr.microsoft.com/devcontainers/base:ubuntu",
+    "features": {
+        "ghcr.io/devcontainers/features/go:1": {},
+        "ghcr.io/devcontainers/features/git:1": {},
+        "ghcr.io/devcontainers/features/github-cli:1": {},
+        "ghcr.io/devcontainers/features/kubectl-helm-minikube:1": {
+            "minikube": "none"
+        },
+        "ghcr.io/devcontainers/features/docker-in-docker:2": {
+            "version": "latest",
+            "moby": true
+        }
+    },
+    "customizations": {
+        "vscode": {
+            "extensions": [
+                "redhat.vscode-yaml",
+                "golang.go",
+                "ms-azuretools.rad-vscode-bicep",
+                "ms-kubernetes-tools.vscode-kubernetes-tools"
+            ]
+        }
+    }
+}

.vscode/launch.json

@@ -4,6 +4,26 @@
     // For more information, visit: https://go.microsoft.com/fwlink/?linkid=830387
     "version": "0.2.0",
     "configurations": [
+        {
+            "name": "Debug rad CLI",
+            "type": "go",
+            "request": "launch",
+            "mode": "auto",
+            "preLaunchTask": "Build Radius (all)",
+            "program": "${workspaceFolder}/cmd/rad/main.go",
+            "cwd": "${workspaceFolder}",
+            "args": [],
+        },
+        {
+            "name": "Debug rad CLI (prompt for args)",
+            "type": "go",
+            "request": "launch",
+            "mode": "debug",
+            "preLaunchTask": "Build Radius (all)",
+            "program": "${workspaceFolder}/cmd/rad",
+            "args": "${input:cliArgs}",
+            "console": "integratedTerminal",
+        },
         {
             "name": "Launch Applications RP",
             "type": "go",
@@ -51,16 +71,6 @@
                 "RADIUS_ENV": "self-hosted"
             }
         },
-        {
-            "name": "Launch rad CLI",
-            "type": "go",
-            "request": "launch",
-            "mode": "auto",
-            "preLaunchTask": "Build Radius (all)",
-            "program": "${workspaceFolder}/cmd/rad/main.go",
-            "cwd": "${workspaceFolder}",
-            "args": [],
-        },
         {
             "name": "Launch Deployment Engine",
             "type": "coreclr",
@@ -89,5 +99,13 @@
             ],
             "stopAll": true
         }
+    ],
+    "inputs": [
+        {
+            "id": "cliArgs",
+            "type": "promptString",
+            "description": "Args for launching Radius cli. Use --cwd to set the working directory.",
+            "default": "init --full"
+        }
     ]
 }