naive rebase to pravega master

[cheleb]

• Issue 482: Reevaluating number of client connections dynamically in the teardown script (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

(2-3 concise points about the changes in this PR. When committing this PR, the committer is expected to copy the content of this section to the merge description box)

Purpose of the change

(e.g., Fixes #666, Closes #1234)

What the code does

(Detailed description of the code changes)

How to verify it

(Steps to verify that the changes are effective)

[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.06 🎉

Comparison is base (ae23010) 85.05% compared to head (fb86bc6) 85.12%.

Additional details and impacted files

@@            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              

Impacted Files	Coverage Δ
api/v1beta1/zookeepercluster_types.go	98.80% <ø> (ø)
api/v1beta1/zz_generated.deepcopy.go	97.95% <100.00%> (+0.03%)	⬆️
controllers/zookeepercluster_controller.go	65.46% <100.00%> (ø)
pkg/zk/generators.go	100.00% <100.00%> (ø)

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