Release workflow in CI

[didoda]

This introduces release workflow.

When a PR with proper label is merged, a new release is created by this workflow.

Labels:

• release:major
• release:minor
• release:patch

[codecov]

Codecov Report

Merging #10 (8a23dc0) into master (d75163b) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff            @@
##             master     #10   +/-   ##
========================================
  Coverage      97.7%   97.7%           
  Complexity       68      68           
========================================
  Files             7       7           
  Lines           180     180           
========================================
  Hits            176     176           
  Misses            4       4           

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update d75163b...8a23dc0. Read the comment docs.