Install and run migrations before running specs

[elia]

Summary

This script will check for missing/changed/removed migrations in the dummy app and will keep them up to date before running specs.

If no changes happened it quickly exits without doing any changes.

Checklist

Check out our PR guidelines for more details.

The following are mandatory for all PRs:

• [ ] I have written a thorough PR description.
• [ ] I have kept my commits small and atomic.
• [ ] I have used clear, explanatory commit messages.

The following are not always needed:

• 📖 I have updated the README to account for my changes.
• 📑 I have documented new code with YARD.
• 🛣️ I have opened a PR to update the guides.
• ✅ I have added automated tests to cover my changes.
• 📸 I have attached screenshots to demo visual changes.

[codecov[bot]]

Codecov Report

Merging #229 (045a1d6) into master (61684eb) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #229   +/-   ##
=======================================
  Coverage   95.51%   95.51%           
=======================================
  Files          23       23           
  Lines         424      424           
=======================================
  Hits          405      405           
  Misses         19       19           

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