Configure classic publish notifications#2107
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edmorley
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Jun 16, 2026
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Summary
Configures the classic Python buildpack into the publish notifications added to the shared
_classic-buildpack-publish.ymlworkflow (heroku/languages-github-actions#370, already merged):app_id+app_private_key) so the workflow'snotify-start/notify-failurejobs can comment on the triggering "Prepare release" PR and author the GitHub Release as the App — matching the CNB release automation.BUILDPACK_RELEASE_FAILURE_WEBHOOK_URLrepo secret as the workflow'sslack_webhook_urlinput, so production publish failures post to#heroku-languages-ops.The reusable workflow now declares
app_id(input) plusapp_private_key/slack_webhook_url(secrets) as required, so a caller that doesn't pass them errors at theworkflow_call. This PR supplies all three.Prerequisites
vars.LINGUIST_GH_APP_IDandsecrets.LINGUIST_GH_PRIVATE_KEY— org-level, already used byprepare_release.yml.BUILDPACK_RELEASE_FAILURE_WEBHOOK_URLrepo secret (Slack Workflow Builder webhook for#heroku-languages-ops) — must be set on this repo before the next release (will be provisioned manually).W-22900983