Fix: Disable summary when it is not available

[philipparndt]

Fix for unsupported step summary on GHE

The workflow summary is currently not available on GitHub Enterprise.

When trying to use the API it will result in the following error:

Error: Unable to find environment variable for $GITHUB_STEP_SUMMARY. Check if your runtime environment supports job summaries.
    at Summary.<anonymous> (/runner/_work/_actions/philipparndt/cy-github-action/disable-summary-on-ghe/dist/index.js:1810:23)
Error: Unable to find environment variable for $GITHUB_STEP_SUMMARY. Check if your runtime environment supports job summaries.
    at Generator.next (<anonymous>)
    at /runner/_work/_actions/philipparndt/cy-github-action/disable-summary-on-ghe/dist/index.js:1783:71
    at new Promise (<anonymous>)
    at __webpack_modules__.1327.__awaiter (/runner/_work/_actions/philipparndt/cy-github-action/disable-summary-on-ghe/dist/index.js:1779:12)
    at Summary.filePath (/runner/_work/_actions/philipparndt/cy-github-action/disable-summary-on-ghe/dist/index.js:1804:16)
    at Summary.<anonymous> (/runner/_work/_actions/philipparndt/cy-github-action/disable-summary-on-ghe/dist/index.js:1850:41)
    at Generator.next (<anonymous>)
    at /runner/_work/_actions/philipparndt/cy-github-action/disable-summary-on-ghe/dist/index.js:1783:71
    at new Promise (<anonymous>)
    at __webpack_modules__.1327.__awaiter (/runner/_work/_actions/philipparndt/cy-github-action/disable-summary-on-ghe/dist/index.js:1779:12)
    at Summary.write (/runner/_work/_actions/philipparndt/cy-github-action/disable-summary-on-ghe/dist/index.js:1848:16)
    at generateSummary (/runner/_work/_actions/philipparndt/cy-github-action/disable-summary-on-ghe/dist/index.js:75393:6)
    at tryCatcher (/runner/_work/vehub-frontend/vehub-frontend/vehub/node_modules/bluebird/js/release/util.js:16:23)
    at Promise._settlePromiseFromHandler (/runner/_work/vehub-frontend/vehub-frontend/vehub/node_modules/bluebird/js/release/promise.js:547:31)
    at Promise._settlePromise (/runner/_work/vehub-frontend/vehub-frontend/vehub/node_modules/bluebird/js/release/promise.js:604:18)

This change checks whether or not the feature is available.
It will help to

• get this great feature as soon as GHE supports the feature
• and stay up-to-date with the latest cypress-io/github-action version

fixes #570

[CLAassistant]

All committers have signed the CLA.

[admah]

@philipparndt thank you for submitting this. Could you update the commit message to match semantic-commit convention so that a new build will get triggered once merged?

[admah]

Do you have a link to where this env var is documented?

[philipparndt]

thanks for the review. The variable was not correct, I'm sorry for that. I should have imported the constant instead.
Can you please have a look at the updated code?

[github-actions]

🎉 This PR is included in version 4.1.1 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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