docker: configDir

Signed-off-by: CrazyMax <crazy-max@users.noreply.github.com>

__tests__/docker.test.ts

@@ -14,8 +14,10 @@
  * limitations under the License.
  */
 
-import {beforeEach, describe, expect, it, jest} from '@jest/globals';
+import {afterEach, beforeEach, describe, expect, it, jest} from '@jest/globals';
 import * as exec from '@actions/exec';
+import path from 'path';
+import osm = require('os');
 
 import {Docker} from '../src/docker';
 
@@ -23,6 +25,28 @@ beforeEach(() => {
   jest.clearAllMocks();
 });
 
+describe('configDir', () => {
+  const originalEnv = process.env;
+  beforeEach(() => {
+    jest.resetModules();
+    process.env = {
+      ...originalEnv,
+      DOCKER_CONFIG: '/var/docker/config'
+    };
+  });
+  afterEach(() => {
+    process.env = originalEnv;
+  });
+  it('returns default', async () => {
+    process.env.DOCKER_CONFIG = '';
+    jest.spyOn(osm, 'homedir').mockImplementation(() => path.join('/tmp', 'home'));
+    expect(Docker.configDir).toEqual(path.join('/tmp', 'home', '.docker'));
+  });
+  it('returns from env', async () => {
+    expect(Docker.configDir).toEqual('/var/docker/config');
+  });
+});
+
 describe('isAvailable', () => {
   it('cli', () => {
     const execSpy = jest.spyOn(exec, 'getExecOutput');

src/docker.ts

@@ -14,9 +14,15 @@
  * limitations under the License.
  */
 
+import os from 'os';
+import path from 'path';
 import * as exec from '@actions/exec';
 
 export class Docker {
+  static get configDir(): string {
+    return process.env.DOCKER_CONFIG || path.join(os.homedir(), '.docker');
+  }
+
   public static isAvailable(): boolean {
     let dockerAvailable = false;
     exec