naive rebase to pravega master

[cheleb]

• Issue 482: Reevaluating number of client connections dynamically in the teardown script (#483)
• use arm64 for go
• adds docker multiarch builds and use it in push
• change repo for testing
• minor rework, push mutliarch directly
• adds checkout to ci.yaml
• fixes job naming
• reworks ci
• fixes variable name
• finally...
• fixed missing slash
• undo changes for testing

Change log description

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Purpose of the change

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What the code does

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How to verify it

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[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 85.12%. Comparing base (ae23010) to head (fb86bc6). Report is 19 commits behind head on master.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #550 +/- ## ========================================== + Coverage 85.05% 85.12% +0.06% ========================================== Files 12 12 Lines 1606 1613 +7 ========================================== + Hits 1366 1373 +7 Misses 155 155 Partials 85 85 ```

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