DX: Trigger Build from TUI (branch, commit, message, env)

[alexhraber]

Problem

The Buildkite CLI (bk build create) can trigger new builds with custom parameters. builddeck can only observe and take actions on existing builds — there is no way to spawn a new build from the TUI.

Proposed Feature

Add a build creation overlay (e.g. keybinding Shift+B) that lets you fill in:

Field	Pre-fill	Notes
Pipeline	Current selected pipeline	Read-only in that context
Branch	Git-tracked branch from $(git rev-parse --abbrev-ref HEAD)	Editable
Commit	HEAD SHA	Editable
Message	git log -1 --format=%s	Editable, multiline
Environment Variables	Empty key=value list	Add/remove rows

UX

┌──────────────────────────────────────┐
│  Trigger Build                        │
│                                       │
│  Pipeline: my-org/my-pipeline         │
│  Branch:  [main                    ]  │
│  Commit:  [abc1234...              ]  │
│  Message: [Fix the thing           ]  │
│  ┌─── Env Vars ──────────────────┐   │
│  │ MY_VAR = value                │   │
│  │ DEBUG  = true                 │   │
│  │ [+ Add]                       │   │
│  └───────────────────────────────┘   │
│                                       │
│  [Cancel]  [Trigger Build →]         │
└──────────────────────────────────────┘

On submit: POST to Buildkite API → show confirmation in status bar → optionally auto-navigate to the new build.

Why this fits a TUI

• Engineers frequently need to re-run with different parameters (different branch, debug flags)
• The TUI already shows pipeline context — pre-filling from it removes friction
• No browser needed to kick off a custom build

References

• bk build create in buildkite/cli
• Buildkite REST API: POST /v2/organizations/{org}/pipelines/{pipeline}/builds

Acceptance

• Shift+B opens build creation overlay on center or right pane
• Branch/commit/message pre-filled from local git when available
• Env var rows are addable/removable
• enter submits, esc cancels
• Loading state while API processes
• Success navigates to new build; failure shows error in status bar