Add Google Cloud CLI feature and tests (#6)

src/google-cloud-cli/README.md

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+# google-cloud-cli
+
+Install the [Google Cloud CLI](https://cloud.google.com/cli).
+
+## Usage
+
+```json
+"features": {
+  "ghcr.io/CargoSense/devcontainer-features/google-cloud-cli:1": {}
+}
+```
+
+## Options
+
+| Option ID | Description                              | Type   | Default Value |
+|:----------|:-----------------------------------------|:-------|:--------------|
+| `version` | The google-cloud-cli version to install. | string | `latest`      |
+
+## OS Support
+
+This Feature should work on recent versions of Debian/Ubuntu and Linux distributions using the [apt](https://wiki.debian.org/AptCLI) management tool.

src/google-cloud-cli/devcontainer-feature.json

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+{
+  "name": "Google Cloud CLI",
+  "id": "google-cloud-cli",
+  "version": "1.1.0",
+  "description": "Install Google Cloud CLI, a tool for creating and managing Google Cloud resources and services.",
+  "options": {
+    "version": {
+      "type": "string",
+      "proposals": [
+        "latest"
+      ],
+      "default": "latest",
+      "description": "Select or enter a Google Cloud CLI version."
+    }
+  },
+  "installsAfter": [
+    "ghcr.io/devcontainers/features/common-utils"
+  ]
+}

src/google-cloud-cli/install.sh

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+#!/usr/bin/env sh
+
+set -e
+
+GOOGLE_CLOUD_CLI_VERSION="${VERSION:-"latest"}"
+
+if [ "$(id -u)" -ne 0 ]; then
+  printf 'Script must be run as root. Use sudo, su, or add "USER root" to your Dockerfile before running this script.'
+  exit 1
+fi
+
+curl_installed=""
+gpg_installed=""
+
+if ! type curl >/dev/null 2>&1; then
+  apt-get update --yes
+  apt-get install --no-install-recommends --yes curl ca-certificates
+
+  curl_installed="true"
+fi
+
+if ! type gpg >/dev/null 2>&1; then
+  apt-get update --yes
+  apt-get install --no-install-recommends --yes gpg
+
+  gpg_installed="true"
+fi
+
+curl https://packages.cloud.google.com/apt/doc/apt-key.gpg | gpg --dearmor -o /usr/share/keyrings/cloud.google.gpg
+echo "deb [signed-by=/usr/share/keyrings/cloud.google.gpg] https://packages.cloud.google.com/apt cloud-sdk main" | tee -a /etc/apt/sources.list.d/google-cloud-sdk.list
+
+apt-get update --yes
+
+if [ "${GOOGLE_CLOUD_CLI_VERSION}" = "latest" ]; then
+  apt-get install --no-install-recommends --yes postgresql-client
+else
+  apt-get install --no-install-recommends --yes google-cloud-cli="${GOOGLE_CLOUD_CLI_VERSION}"
+fi
+
+if  [ -n "${curl_installed}" ]; then
+  apt purge curl --autoremove --yes
+fi
+
+if [ -n "${gpg_installed}" ]; then
+  apt purge gpg --autoremove --yes
+fi

test/google-cloud-cli/install-bookworm-with-settings.sh

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+#!/usr/bin/env bash
+
+set -e
+
+# Optional: Import test library bundled with the devcontainer CLI
+# shellcheck source=/dev/null
+source dev-container-features-test-lib
+
+# Feature-specific tests
+check "version" bash -c "gcloud --version | grep 1.6.20"
+check "which gcloud" bash -c "which gcloud | grep /usr/bin/gcloud"
+
+# Report result
+reportResults

test/google-cloud-cli/install-bookworm.sh

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+#!/usr/bin/env bash
+
+set -e
+
+# Optional: Import test library bundled with the devcontainer CLI
+# shellcheck source=/dev/null
+source dev-container-features-test-lib
+
+# Feature-specific tests
+check "version" gcloud --version
+check "which gcloud" bash -c "which gcloud | grep /usr/bin/gcloud"
+
+# Report result
+reportResults

test/google-cloud-cli/scenarios.json

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+{
+  "install-bookworm": {
+    "image": "debian:bookworm",
+    "features": {
+      "google-cloud-cli": {
+        "version": "latest"
+      }
+    }
+  },
+
+  "install-bookworm-with-settings": {
+    "image": "debian:bookworm",
+    "features": {
+      "google-cloud-cli": {
+        "version": "371.0.0-0"
+      }
+    }
+  }
+}

test/google-cloud-cli/test.sh

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+#!/usr/bin/env bash
+
+set -e
+
+# Optional: Import test library bundled with the devcontainer CLI
+# shellcheck source=/dev/null
+source dev-container-features-test-lib
+
+# Feature-specific tests
+check "version" gcloud --version
+check "which gcloud" bash -c "which gcloud | grep /usr/bin/gcloud"
+
+# Report result
+reportResults