gha(update-docs-webhook): fix workflow syntax

[taraspos]

Summary

Workflow syntax introduced in:

• Remove Vercel webhook call #50579

Currently this action is failing on some of the branches where backports were merged:

• https://github.com/gravitational/teleport/actions/workflows/update-docs-webhook.yaml?query=branch%3Amaster

[fheinecke]

LGTM. Would prefer consistent syntax with other workflows (unless there is some advantage to this approach) but this is really minor.

[fheinecke]

nit: Why use this syntax instead of the secrets.AMPLIFY_DOCS_DEPLOY_HOOK used everywhere else?

[taraspos]

It was done this way to support matrix, when we had to call two webhooks:

• teleport/.github/workflows/update-docs-webhook.yaml

  Lines 18 to 31 in b84f071

  	matrix:
  	webhooks:
  	- url_secret_name: DOCS_DEPLOY_HOOK
  	http_method: GET
  	- url_secret_name: AMPLIFY_DOCS_DEPLOY_HOOK
  	http_method: POST
  	steps:
  	- name: Call deployment webhook
  	env:
  	WEBHOOK_URL: ${{ secrets[matrix.webhooks.url_secret_name] }}
  	run: |
  	if curl -X ${{ matrix.webhooks.http_method }} --silent --fail --show-error "$WEBHOOK_URL" > /dev/null; then
  	echo "Triggered successfully"
  	fi

Now when second webhook and matrix is removed, there is no real reason to keep it this way.

[taraspos]

Updated in a9b7765

[public-teleport-github-review-bot]

@taraspos See the table below for backport results.

Branch	Result
branch/v15	Create PR
branch/v16	Create PR
branch/v17	Create PR