Enable release mode builds #8

Job	Run time
Integration tests	3m 26s
Unit tests / Construct unit test matrix	4s
Release builds / Construct release build matrix	4s
Cxx interop / Construct Cxx interop matrix	3s
Soundness / Shell check	39s
Soundness / Python lint check	6s
Soundness / Unacceptable language check	3s
Soundness / Broken symlinks check	6s
Soundness / API breakage check	5m 2s
Soundness / YAML lint check	4s
Soundness / Format check	32s
Soundness / License headers check	3s
Soundness / Documentation check	40s
Cxx interop / Cxx interop / Linux (nightly-next)	4m 31s
Cxx interop / Cxx interop / Linux (6.0)	3m 15s
Cxx interop / Cxx interop / Linux (5.10)	2m 58s
Cxx interop / Cxx interop / Linux (6.1)	3m 21s
Cxx interop / Cxx interop / Linux (nightly-main)	4m 18s
Release builds / Release builds / Linux (nightly-next)	5m 46s
Release builds / Release builds / Linux (5.10)	4m 17s
Release builds / Release builds / Linux (6.1)	4m 22s
Release builds / Release builds / Linux (6.0)	4m 32s
Release builds / Release builds / Linux (nightly-main)	5m 39s
Unit tests / Unit tests / Linux (nightly-next)	4m 10s
Unit tests / Unit tests / Linux (6.0)	3m 21s
Unit tests / Unit tests / Linux (5.10)	2m 57s
Unit tests / Unit tests / Linux (6.1)	3m 11s
Unit tests / Unit tests / Linux (nightly-main)	4m 8s
	1h 11m 38s

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