ci: bump ignite app

[julienrbrt]

ignite/apps#212 got merged, the ignite app got improved.
this updates it here in CI

[gemini-code-assist]

Summary of Changes

Hello @julienrbrt, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request updates the Dockerfile to pin the version of the ignite/apps/rollkit application used in the CI environment. This change aligns the CI setup with recent improvements merged in the upstream ignite/apps repository, ensuring a consistent and stable build process by using a specific version rather than the main branch.

Highlights

• Version Pinning: Introduced a new environment variable IGNITE_ROLLKIT_APP_VERSION set to v0.3.0 in the Dockerfile to explicitly define the version of the ignite/apps/rollkit application.
• CI Dependency Update: Modified the ignite app install command within the Dockerfile to utilize the newly defined IGNITE_ROLLKIT_APP_VERSION variable. This ensures that the CI pipeline installs a specific, stable version of the ignite/apps/rollkit application, moving away from tracking the main branch.

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[gemini-code-assist]

Code Review

This pull request updates the CI Dockerfile to use a specific version of the Ignite app (v0.3.0) instead of tracking the main branch. This is a good practice for ensuring reproducible builds. My review includes one suggestion to further improve reproducibility by using a commit SHA instead of a git tag, as tags can be mutable.