Build Docker manifest only when all dependencies are ready

[omus]

Fixes #6541. The push-linux-amd64-images step is the same as the push-images step but only used the linux/amd64 platform.

[codecov]

Codecov Report

Merging #6621 (1bc8aea) into master (e10f644) will increase coverage by 0.00%.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #6621   +/-   ##
=======================================
  Coverage   48.49%   48.49%           
=======================================
  Files         261      261           
  Lines       18955    18978   +23     
=======================================
+ Hits         9192     9204   +12     
- Misses       8740     8746    +6     
- Partials     1023     1028    +5     

Impacted Files	Coverage Δ
workflow/sync/chain_throttler.go	68.75% <0.00%> (-31.25%)	⬇️
workflow/metrics/server.go	15.78% <0.00%> (-3.51%)	⬇️
workflow/sync/throttler.go	93.20% <0.00%> (-3.39%)	⬇️
server/workflow/workflow_server.go	44.41% <0.00%> (-2.40%)	⬇️
workflow/controller/operator.go	71.47% <0.00%> (-0.10%)	⬇️
cmd/argo/commands/get.go	59.18% <0.00%> (+0.87%)	⬆️
workflow/controller/controller.go	22.46% <0.00%> (+1.48%)	⬆️

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