Bump dockerfile-rails from 1.6.7 to 1.6.8

[dependabot[bot]]

Bumps dockerfile-rails from 1.6.7 to 1.6.8.

Release notes

Sourced from dockerfile-rails's releases.

v1.6.8

What's Changed

• Do not try to get node version unless node is installed by @​luizkowalski in fly-apps/dockerfile-rails#91
• Support Litefs database migrations with multiple machines in primary - fly-apps/dockerfile-rails#92

Full Changelog: https://github.com/fly-apps/dockerfile-rails/compare/v1.6.7...v1.6.8

Commits

• 1281068 push out a release [ci skip]
• d15301e Support Litefs database migrations with multiple machines in primary
• 42e716c enable running individual tests under bundler
• 8b022a5 drop "--main" from bun test
• 16dfb4c Do not try to get node version unless node is installed (#91)
• See full diff in compare view

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