use Util.parseBool to parse env

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

README.md

@@ -346,7 +346,7 @@ So it can be used with our [Docker Build Push action](https://github.com/docker/
 | `DOCKER_METADATA_PR_HEAD_SHA`        | Bool   | If `true`, set associated head SHA instead of commit SHA that triggered the workflow on pull request event                                   |
 | `DOCKER_METADATA_SHORT_SHA_LENGTH`   | Number | Specifies the length of the [short commit SHA](#typesha) to ensure uniqueness. Default is `7`, but can be increased for larger repositories. |
 | `DOCKER_METADATA_ANNOTATIONS_LEVELS` | String | Comma separated list of annotations levels to set for annotations output separated (default `manifest`)                                      |
-| `DOCKER_METADATA_SET_OUTPUT_ENV`     | Bool   | If `true`, sets each output as an environmental variable (default `true`)                                                                    |
+| `DOCKER_METADATA_SET_OUTPUT_ENV`     | Bool   | If `true`, sets each output as an environment variable (default `true`)                                                                      |
 
 ## `context` input
 

src/main.ts

@@ -2,6 +2,7 @@ import * as fs from 'fs';
 import * as core from '@actions/core';
 import * as actionsToolkit from '@docker/actions-toolkit';
 import {Toolkit} from '@docker/actions-toolkit/lib/toolkit';
+import {Util} from '@docker/actions-toolkit/lib/util';
 
 import {getContext, getInputs, Inputs} from './context';
 import {Meta, Version} from './meta';
@@ -13,8 +14,7 @@ actionsToolkit.run(
     const toolkit = new Toolkit({githubToken: inputs.githubToken});
     const context = await getContext(inputs.context, toolkit);
     const repo = await toolkit.github.repoData();
-    const outputEnv = (process.env.DOCKER_METADATA_SET_OUTPUT_ENV || 'true') === 'true';
-    const setOutput = outputEnv ? setOutputAndEnv : core.setOutput;
+    const setOutput = outputEnvEnabled() ? setOutputAndEnv : core.setOutput;
 
     await core.group(`Context info`, async () => {
       core.info(`eventName: ${context.eventName}`);
@@ -111,3 +111,10 @@ function setOutputAndEnv(name: string, value: string) {
   core.setOutput(name, value);
   core.exportVariable(`DOCKER_METADATA_OUTPUT_${name.replace(/\W/g, '_').toUpperCase()}`, value);
 }
+
+function outputEnvEnabled(): boolean {
+  if (process.env.DOCKER_METADATA_SET_OUTPUT_ENV) {
+    return Util.parseBool(process.env.DOCKER_METADATA_SET_OUTPUT_ENV);
+  }
+  return true;
+}