feat: upgrade tty image and allow for configuration through env

[merll]

Example values to test

kind: AplApp
metadata:
    name: otomi-api
spec:
    _rawValues:
        image:
            pullPolicy: Always
            repository: docker.io/linode/apl-api
            tag: APL-2071
        env:
            TTY_IMAGE_REPOSITORY: mirror.registry.linodelke.net/docker/linode/apl-tty
            TTY_IMAGE_TAG: 1.2.8

[Copilot]

Pull request overview

Adds environment-driven configuration for the CloudTty (cloud shell) container image, and updates the default image tag to the newer version while keeping existing behavior via sane defaults.

Changes:

• Introduces TTY_IMAGE_REPOSITORY and TTY_IMAGE_TAG environment validators with defaults (linode/apl-tty:1.2.8).
• Updates CloudTty to accept an injected image config and uses it when creating the TTY Pod.
• Wires OtomiStack.getCloudTty() to construct CloudTty using the validated env values and updates tests accordingly.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated no comments.

File	Description
src/validators.ts	Adds env validators for TTY image repository/tag with defaults.
src/tty.ts	Makes TTY image configurable via constructor-injected config and uses it in Pod spec.
src/tty.test.ts	Updates tests to pass the new TtyConfig and asserts the configured image string.
src/otomi-stack.ts	Passes env-derived TTY image config into the CloudTty instance.

---

💡 Add a code-review agent skill or configure MCP servers for context-aware, tailored reviews. Learn more in the docs.