PG-1486 Add ARM64 builds in CI and add Slack notifications

[artemgavrilov]

https://perconadev.atlassian.net/browse/PG-1486

Just added ARM64 builds. It seems that everything fine there.

Note: ARM based runners still in preview

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 84.65%. Comparing base (5610639) to head (7320591).

❌ Your project status has failed because the head coverage (84.65%) is below the target coverage (90.00%). You can increase the head coverage or adjust the target coverage.

Additional details and impacted files

@@                  Coverage Diff                  @@
##           TDE_REL_17_STABLE     #401      +/-   ##
=====================================================
- Coverage              84.66%   84.65%   -0.01%     
=====================================================
  Files                     21       21              
  Lines                   2589     2588       -1     
  Branches                 402      401       -1     
=====================================================
- Hits                    2192     2191       -1     
  Misses                   316      316              
  Partials                  81       81              

Components	Coverage Δ
access	81.11% <ø> (ø)
catalog	88.22% <ø> (ø)
common	77.77% <ø> (ø)
encryption	73.45% <ø> (ø)
keyring	72.88% <ø> (ø)
src	91.44% <ø> (ø)
smgr	94.85% <ø> (-0.03%)	⬇️
transam	∅ <ø> (∅)

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