(pipelines): generate shell script and call that in assets instead of requiring self mutation

[Hi-Fi]

Description

Currently asset stage command are directly at the build spec. Those include e.g. image hashes, that require self mutation to get new image published.

If synth would just generate command to shell script and asset stage call that shell script (as it already get the input from cdk.out) purely application updates woudn't require self mutation.

Use Case

• Simplifies and speeds up running
• No need to have self mutation enabled

Proposed Solution

• generate shell script to cdk.out during synth that handles the cdk-assets calls
• Call "statically" that shell script so that self mutate step doesn't need to be updated all the time

Other information

No response

Acknowledge

• I may be able to implement this feature request
• This feature might incur a breaking change

[rix0rrr]

Duplicate of #9080

[github-actions]

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[hoegertn]

Using publishAssetsInParallel: false on the pipeline you can achieve this to some degree