ci: enable installer XML reminder

[karthikbekalp]

Depends on: aws-deadline/.github#109. Merge that PR first so the shared workflow is available on mainline.

What was the problem/requirement? (What/Why)

Some changes in individual submitter installers were missing from the shared installer. Authors need a reminder to review matching updates.

What was the solution? (How)

Add .github/workflows/installer_xml_check.yml to call the shared Python check. It flags XML changes under installer/ or install_builder/ and lists the changed files in the log.

What is the impact of this change?

This submitter is included in the shared installer. The check runs on PRs, including drafts. When it flags a change, review whether the shared installer needs an update and confirm any follow-up in the PR discussion. Keep private details and links out of public discussions.

How was this change tested?

• The caller workflow passed actionlint and zizmor validation.
• The shared checker was tested in this Cinema 4D Actions run: an XML edit produced the expected reminder and failed check.
• Application tests were not run for this workflow-only change.

Was this change documented?

Setup and follow-up are documented in installer-xml-changes.md in the shared workflow PR.

Did you modify schema files?

• Yes
• No

Is this a breaking change?

No.

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[github-actions]

Claude review · advisory

Reviewed dd205b6 (full review): 0 findings.

Open: 0 blocking · 0 should-fix · 0 nit. ✅ Nothing blocking.

_{Fix or reply to each thread; the next revision's review re-checks open threads and resolves those it agrees are handled. Resolving a thread yourself also closes it. Later revisions review only what changed.}