feat: Support authentication from Auth Action (#48)

* feat: support WIF creds file

* add tests

* deps

* regen docs

* fix test

* reuse write file from auth

* prune uuid deps

* regen docs

docs/README.md

@@ -28,7 +28,7 @@ npm install @google-github-actions/setup-cloud-sdk
 ```TS
 import * as core from '@actions/core';
 import * as toolCache from '@actions/tool-cache';
-import * as setupGcloud from 'setup-cloud-sdk';
+import * as setupGcloud from '@google-github-actions/setup-cloud-sdk';
 
 // Install gcloud if not already installed.
 const gcloudVersion = await setupGcloud.getLatestGcloudSDKVersion();

docs/modules.md

@@ -23,16 +23,18 @@
 
 ### authenticateGcloudSDK
 
-▸ **authenticateGcloudSDK**(`serviceAccountKey`, `silent?`): `Promise`<`number`\>
+▸ **authenticateGcloudSDK**(`serviceAccountKey?`, `silent?`): `Promise`<`number`\>
 
-Authenticates the gcloud tool using a service account key.
+Authenticates the gcloud tool using a service account key or WIF credential configuration
+discovered via GOOGLE_GHA_CREDS_PATH environment variable. An optional serviceAccountKey
+param is supported for legacy Actions.
 
 #### Parameters
 
 | Name | Type | Default value | Description |
 | :------ | :------ | :------ | :------ |
-| `serviceAccountKey` | `string` | `undefined` | The service account key used for authentication. |
-| `silent` | `boolean` | `true` | - |
+| `serviceAccountKey?` | `string` | `undefined` | The service account key used for authentication. |
+| `silent` | `boolean` | `true` | Skip writing output to sdout. |
 
 #### Returns
 
@@ -42,7 +44,7 @@ exit code.
 
 #### Defined in
 
-[index.ts:182](https://github.com/google-github-actions/setup-cloud-sdk/blob/3de11b9/src/index.ts#L182)
+[index.ts:201](https://github.com/google-github-actions/setup-cloud-sdk/blob/ed4039f/src/index.ts#L201)
 
 ___
 
@@ -58,7 +60,7 @@ The latest stable version of the gcloud SDK.
 
 #### Defined in
 
-[version-util.ts:27](https://github.com/google-github-actions/setup-cloud-sdk/blob/3de11b9/src/version-util.ts#L27)
+[version-util.ts:27](https://github.com/google-github-actions/setup-cloud-sdk/blob/ed4039f/src/version-util.ts#L27)
 
 ___
 
@@ -76,7 +78,7 @@ gcloud command.
 
 #### Defined in
 
-[index.ts:49](https://github.com/google-github-actions/setup-cloud-sdk/blob/3de11b9/src/index.ts#L49)
+[index.ts:50](https://github.com/google-github-actions/setup-cloud-sdk/blob/ed4039f/src/index.ts#L50)
 
 ___
 
@@ -101,7 +103,7 @@ CMD output
 
 #### Defined in
 
-[index.ts:250](https://github.com/google-github-actions/setup-cloud-sdk/blob/3de11b9/src/index.ts#L250)
+[index.ts:321](https://github.com/google-github-actions/setup-cloud-sdk/blob/ed4039f/src/index.ts#L321)
 
 ___
 
@@ -125,7 +127,7 @@ The path of the installed tool.
 
 #### Defined in
 
-[index.ts:119](https://github.com/google-github-actions/setup-cloud-sdk/blob/3de11b9/src/index.ts#L119)
+[index.ts:120](https://github.com/google-github-actions/setup-cloud-sdk/blob/ed4039f/src/index.ts#L120)
 
 ___
 
@@ -149,7 +151,7 @@ true is gcloud is authenticated.
 
 #### Defined in
 
-[index.ts:91](https://github.com/google-github-actions/setup-cloud-sdk/blob/3de11b9/src/index.ts#L91)
+[index.ts:92](https://github.com/google-github-actions/setup-cloud-sdk/blob/ed4039f/src/index.ts#L92)
 
 ___
 
@@ -173,7 +175,7 @@ true if gcloud is found in toolpath.
 
 #### Defined in
 
-[index.ts:34](https://github.com/google-github-actions/setup-cloud-sdk/blob/3de11b9/src/index.ts#L34)
+[index.ts:35](https://github.com/google-github-actions/setup-cloud-sdk/blob/ed4039f/src/index.ts#L35)
 
 ___
 
@@ -197,7 +199,7 @@ true is project Id is set.
 
 #### Defined in
 
-[index.ts:64](https://github.com/google-github-actions/setup-cloud-sdk/blob/3de11b9/src/index.ts#L64)
+[index.ts:65](https://github.com/google-github-actions/setup-cloud-sdk/blob/ed4039f/src/index.ts#L65)
 
 ___
 
@@ -221,7 +223,7 @@ ServiceAccountKey as an object.
 
 #### Defined in
 
-[index.ts:141](https://github.com/google-github-actions/setup-cloud-sdk/blob/3de11b9/src/index.ts#L141)
+[index.ts:142](https://github.com/google-github-actions/setup-cloud-sdk/blob/ed4039f/src/index.ts#L142)
 
 ___
 
@@ -246,7 +248,7 @@ CMD output
 
 #### Defined in
 
-[index.ts:279](https://github.com/google-github-actions/setup-cloud-sdk/blob/3de11b9/src/index.ts#L279)
+[index.ts:350](https://github.com/google-github-actions/setup-cloud-sdk/blob/ed4039f/src/index.ts#L350)
 
 ___
 
@@ -271,7 +273,7 @@ project ID.
 
 #### Defined in
 
-[index.ts:215](https://github.com/google-github-actions/setup-cloud-sdk/blob/3de11b9/src/index.ts#L215)
+[index.ts:286](https://github.com/google-github-actions/setup-cloud-sdk/blob/ed4039f/src/index.ts#L286)
 
 ___
 
@@ -295,4 +297,4 @@ project ID.
 
 #### Defined in
 
-[index.ts:236](https://github.com/google-github-actions/setup-cloud-sdk/blob/3de11b9/src/index.ts#L236)
+[index.ts:307](https://github.com/google-github-actions/setup-cloud-sdk/blob/ed4039f/src/index.ts#L307)