Auto-run CI build workflow for all PRs

[Ma77Ball]

Description:

Currently, the build workflow requires manual intervention before running on certain PRs. The workflow should run automatically for all contributors without any extra steps required.

Expected Behavior:

All three build jobs (frontend, scala, python) should trigger automatically on push, pull_request, and workflow_dispatch events for all PRs.

Current Behavior:

The build workflow does not run automatically in all cases, requiring extra steps before CI begins.

Proposed Solution:

Simplify the build workflow so that all build jobs trigger directly on standard GitHub events, making CI faster and easier to reason about for all contributors.

[Ma77Ball]

flowchart TD
    A([push / pull_request / dispatch]) --> B[frontend]
    A --> C[scala]
    A --> D[python]
    B --> E([build complete])
    C --> E
    D --> E

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