Add releasing documentation

[MrAlias]

Document how maintainers perform releases.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 46.53%. Comparing base (6fc7f27) to head (b76693b).
⚠️ Report is 2 commits behind head on main.

❗ There is a different number of reports uploaded between BASE (6fc7f27) and HEAD (b76693b). Click for more details.

HEAD has 37 uploads less than BASE

Flag	BASE (6fc7f27)	HEAD (b76693b)
oats-test	5	0
k8s-integration-test	15	0
integration-test-arm	1	0
integration-test	10	0
integration-test-vm-${ARCH}-${KERNEL_VERSION}	6	0

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #850      +/-   ##
==========================================
- Coverage   55.42%   46.53%   -8.90%     
==========================================
  Files         251      251              
  Lines       21400    21400              
==========================================
- Hits        11861     9958    -1903     
- Misses       8731    10808    +2077     
+ Partials      808      634     -174     

Flag	Coverage Δ
integration-test	?
integration-test-arm	?
integration-test-vm-${ARCH}-${KERNEL_VERSION}	?
k8s-integration-test	?
oats-test	?
unittests	46.53% <ø> (-0.01%)	⬇️

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[grcevski]

Awesome!