ci: enable s390x runner #614

Job	Run time
Build Wasm	2m 48s
Build Web UI / Build Treemap WebUI	38s
Tests (ubuntu-latest, unit)	1m 42s
Tests (ubuntu-latest, integration-example)	2m 56s
Tests (ubuntu-latest, integration-real)	5m 30s
Tests (windows-latest, unit)	2m 29s
Tests (windows-latest, integration-example)	5m 25s
Tests (windows-latest, integration-real)	7m 41s
Tests (macos-13, unit)	2m 13s
Tests (macos-13, integration-example)	3m 56s
Tests (macos-13, integration-real)	9m 53s
Tests (macos-14, unit)	1m 29s
Tests (macos-14, integration-example)	3m 41s
Tests (macos-14, integration-real)	5m 38s
Tests (self-hosted, unit)	28s
Tests (self-hosted, integration-example)	7m 5s
Tests (self-hosted, integration-real)	6m 4s
UI Tests	1m 14s
Tests result	0s
Build go-size-analyzer explorer	0s
Merge Go test results	0s
Deploy explorer to GitHub Pages	0s
	1h 10m 50s

Provide feedback