Change init-preview-db workflow trigger to pull_request_target

[flacial]

Closes #2618

Description

An event triggers a GitHub action workflow, it could be when a PR is created or closed, a commit has been pushed, or a new release.

In our case, we've the pull_request:closed trigger that start a workflow when a pull request is closed. It doesn't allow write-access to the repo or read-access to the secrets.

Since it prevents reading the secrets, the workflow for updating the preview DB fails because it needs to read the PREVIEW_DB_KEY secret key.

There's another trigger called pull_request_target:closed that allow a PR executed workflow to read the secrets.

It also makes the workflow run only when a PR is merged.

Solution

Update the trigger to be pull_request_target.

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[codecov]

Codecov Report

Merging #2619 (84be3a5) into master (bca6a74) will not change coverage.
The diff coverage is n/a.

❗ Current head 84be3a5 differs from pull request most recent head 7afc15d. Consider uploading reports for the commit 7afc15d to get more accurate results

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