skip empty registry-auth secret mask

Signed-off-by: CrazyMax <1951866+crazy-max@users.noreply.github.com>

Author: crazy-max

__tests__/context.test.ts

@@ -1,11 +1,12 @@
-import {afterEach, expect, test} from 'vitest';
+import {afterEach, expect, test, vi} from 'vitest';
 import * as path from 'path';
 
 import {Buildx} from '@docker/actions-toolkit/lib/buildx/buildx.js';
 
 import {getAuthList, getInputs} from '../src/context.js';
 
 afterEach(() => {
+  vi.restoreAllMocks();
   for (const key of Object.keys(process.env)) {
     if (key.startsWith('INPUT_')) {
       delete process.env[key];
@@ -33,3 +34,37 @@ test('getAuthList uses the default Docker Hub registry when computing scoped con
     configDir: path.join(Buildx.configDir, 'config', 'registry-1.docker.io', 'myscope')
   });
 });
+
+test('getAuthList skips secret masking when registry-auth password is absent', async () => {
+  const stdoutWriteSpy = vi.spyOn(process.stdout, 'write').mockImplementation(() => true);
+  const [auth] = getAuthList({
+    registry: '',
+    username: '',
+    password: '',
+    scope: '',
+    ecr: '',
+    logout: true,
+    registryAuth: '- registry: public.ecr.aws\n'
+  });
+
+  expect(stdoutWriteSpy.mock.calls.map(call => call[0]).join('')).not.toContain('::add-mask::');
+  expect(auth).toMatchObject({
+    registry: 'public.ecr.aws',
+    ecr: 'auto'
+  });
+});
+
+test('getAuthList masks registry-auth password when present', async () => {
+  const stdoutWriteSpy = vi.spyOn(process.stdout, 'write').mockImplementation(() => true);
+  getAuthList({
+    registry: '',
+    username: '',
+    password: '',
+    scope: '',
+    ecr: '',
+    logout: true,
+    registryAuth: '- registry: ghcr.io\n  username: dbowie\n  password: groundcontrol\n'
+  });
+
+  expect(stdoutWriteSpy.mock.calls.map(call => call[0]).join('')).toContain('::add-mask::groundcontrol');
+});

src/context.ts

@@ -53,7 +53,9 @@ export function getAuthList(inputs: Inputs): Array<Auth> {
     });
   } else {
     auths = (yaml.load(inputs.registryAuth) as Array<Auth>).map(auth => {
-      core.setSecret(auth.password); // redacted in workflow logs
+      if (auth.password) {
+        core.setSecret(auth.password); // redacted in workflow logs
+      }
       const registry = auth.registry || 'docker.io';
       return {
         registry,