Bump dockerfile-rails from 1.5.4 to 1.5.7

[dependabot[bot]]

Bumps dockerfile-rails from 1.5.4 to 1.5.7.

Release notes

Sourced from dockerfile-rails's releases.

v1.5.7

What's Changed

• Add Litestack detection and configuration by @​bradgessler in fly-apps/dockerfile-rails#56

Full Changelog: https://github.com/fly-apps/dockerfile-rails/compare/v1.5.6...v1.5.7

v1.5.6

Fix dockerfiles generated when node is not installed locally, and execjs is used

Full Changelog: https://github.com/fly-apps/dockerfile-rails/compare/v1.5.5...v1.5.6

v1.5.5

exclude pids, storage directories in .dockerignore

Full Changelog: https://github.com/fly-apps/dockerfile-rails/compare/v1.5.4...v1.5.5

Commits

• 31c1d3d push out a release [ci skip]
• 58af325 Merge pull request #56 from fly-apps/litestack
• 31437b6 Add Litestack detection and configuration
• 998e4a6 put out a new release [ci skip]
• 4501af9 fix Dockerfile produced when node isn't installed and execjs is used
• 1a82984 push out a release [ci skip]
• 14953b2 update expected test results
• 811f476 exclude pids, storage directories
• See full diff in compare view

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