add a CI "platform" with `assert()`s enabled (`NDEBUG` not defined) #6104

Job	Run time
Discover Versions	1s
Platform Cache / Discover Platforms	3s
Platform Cache / Build Platforms (none)	2s
Run Build Workflow / Build leap (reproducible)	8m 14s
Run Build Workflow / Build leap (ubuntu20)	6m 42s
Run Build Workflow / Build leap (ubuntu22)	7m 18s
Run Build Workflow / Build leap (asserton)	6m 17s
Build deb packages (ubuntu20)	9m 29s
Build deb packages (ubuntu22)	8m 59s
LR Tests (ubuntu20)	24m 3s
Build deb packages (reproducible)	8m 17s
Tests (ubuntu20)	3m 14s
LR Tests (ubuntu22)	24m 13s
NP Tests (ubuntu20)	6m 43s
Tests (ubuntu22)	3m 17s
LR Tests (asserton)	24m 2s
NP Tests (ubuntu22)	5m 13s
Tests (asserton)	3m 18s
NP Tests (asserton)	5m 17s
Tests (ubuntu20repro)	3m 26s
LR Tests (ubuntu20repro)	24m 13s
NP Tests (ubuntu20repro)	6m 50s
Tests (ubuntu22repro)	3m 15s
LR Tests (ubuntu22repro)	24m 12s
NP Tests (ubuntu22repro)	5m 9s
libtester tests (ubuntu22, build-tree)	8m 26s
libtester tests (ubuntu22, make-dev-install)	7m 34s
libtester tests (ubuntu22, deb-install)	4m 9s
All Required Tests Passed	1s
	4h 1m 57s

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