Add feature: circleci-cli.

Author: CodeMan99

src/circleci-cli/devcontainer-feature.json

@@ -0,0 +1,25 @@
+{
+    "name": "CircleCI CLI",
+    "id": "circleci-cli",
+    "version": "1.0.0",
+    "description": "Install the CircleCI CLI.",
+    "options": {
+        "version": {
+            "default": "latest",
+            "description": "Specify what version to install.",
+            "type": "string"
+        },
+        "destdir": {
+            "default": "/usr/local/bin/",
+            "description": "Filesystem location of the circleci binary.",
+            "type": "string"
+        }
+    },
+    "customizations": {
+        "vscode": {
+            "extensions": [
+                "circleci.circleci"
+            ]
+        }
+    }
+}

src/circleci-cli/install.sh

@@ -0,0 +1,13 @@
+#!/usr/bin/env bash
+
+set -e
+
+export VERSION="${VERSION:-latest}"
+export DESTDIR="${DESTDIR:-/usr/local/bin}"
+
+if [[ "$VERSION" = "latest" ]]; then {
+    # The remote script treats empty input as "latest"
+    unset VERSION
+} fi
+
+curl -fLSs https://raw.githubusercontent.com/CircleCI-Public/circleci-cli/master/install.sh | bash

test/circleci-cli/test.sh

@@ -0,0 +1,9 @@
+#!/bin/bash
+
+set -e
+
+source dev-container-features-test-lib
+
+check "version" bash -c "circleci version"
+
+reportResults