documentation for scope input

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

src/context.ts

@@ -3,6 +3,7 @@ import * as core from '@actions/core';
 import * as yaml from 'js-yaml';
 
 import {Buildx} from '@docker/actions-toolkit/lib/buildx/buildx';
+import {Util} from '@docker/actions-toolkit/lib/util';
 
 export interface Inputs {
   registry: string;
@@ -69,7 +70,7 @@ export function getAuthList(inputs: Inputs): Array<Auth> {
 }
 
 export function scopeToConfigDir(registry: string, scope?: string): string {
-  if (!scope || scope === '') {
+  if (scopeDisabled() || !scope || scope === '') {
     return '';
   }
   let configDir = path.join(Buildx.configDir, 'config', registry === 'docker.io' ? 'registry-1.docker.io' : registry);
@@ -80,3 +81,10 @@ export function scopeToConfigDir(registry: string, scope?: string): string {
   }
   return configDir;
 }
+
+function scopeDisabled(): boolean {
+  if (process.env.DOCKER_LOGIN_SCOPE_DISABLED) {
+    return Util.parseBool(process.env.DOCKER_LOGIN_SCOPE_DISABLED);
+  }
+  return false;
+}

src/docker.ts

@@ -56,9 +56,10 @@ export async function loginECR(registry: string, username: string, password: str
 
 async function loginExec(registry: string, username: string, password: string, scope?: string): Promise<void> {
   let envs: {[key: string]: string} | undefined;
-  if (scope && scope !== '') {
+  const configDir = context.scopeToConfigDir(registry, scope);
+  if (configDir !== '') {
     envs = Object.assign({}, process.env, {
-      DOCKER_CONFIG: context.scopeToConfigDir(registry, scope)
+      DOCKER_CONFIG: configDir
     }) as {
       [key: string]: string;
     };