Add weekly build workflow and CI fixes

[spraveenio]

Motivation

Add a weekly scheduled build workflow to automate recurring CI builds and fix TTY issues in the Makefile.

Technical Details

• Added .github/workflows/weekly-build.yml: runs on a weekly schedule and manual dispatch, executes make targets inside a Docker container
• Updated Makefile: added -T flag to docker run invocations to handle non-TTY CI environments

Test Plan

• Triggered manually via workflow_dispatch to verify the workflow runs correctly
• Confirmed make targets execute successfully inside the container

Submission Checklist

• Look over the contributing guidelines at https://github.com/ROCm/ROCm/blob/develop/CONTRIBUTING.md#pull-requests.

[yansun1996]

Since this workflow already runs on the cron schedule plus workflow_dispatch, the push: branches: [main] trigger also rebuilds on every merge to main — so a push and the weekly scheduled run can build in parallel. Is the per-push build intended (e.g. to validate each merge), or should this be dropped so the workflow stays purely scheduled/manual? Mainly want to check it doesn't overlap with the existing per-PR CI.

[spraveenio]

It should be dropped. I’ll fix it

[bhatnitish]

LGTM — workflow is well-structured with a sensible skip-if-unchanged guard, TTY fix is straightforward, and adding docker-build-utils to all fills a gap. Looks good to merge.