Enable release mode builds #33

Job	Run time
Unit tests / Unit tests (nightly-6.1)	2m 7s
Unit tests / Unit tests (5.10)	1m 15s
Unit tests / Unit tests (6.1)	1m 37s
Unit tests / Unit tests (6.0)	1m 33s
Unit tests / Unit tests (nightly-main)	1m 52s
Cxx interop / Construct Cxx interop matrix	4s
Release builds / Construct release build matrix	4s
Soundness / API breakage check	1m 43s
Soundness / Documentation check	1m 37s
Soundness / YAML lint check	4s
Soundness / Shell check	36s
Soundness / Unacceptable language check	6s
Soundness / Python lint check	9s
Soundness / License headers check	6s
Soundness / Broken symlinks check	9s
Soundness / Format check	37s
Cxx interop / Cxx interop / Linux (5.10)	1m 17s
Cxx interop / Cxx interop / Linux (6.0)	1m 21s
Cxx interop / Cxx interop / Linux (6.1)	1m 20s
Cxx interop / Cxx interop / Linux (nightly-next)	1m 50s
Cxx interop / Cxx interop / Linux (nightly-main)	1m 40s
Release builds / Release builds / Linux (6.0)	1m 41s
Release builds / Release builds / Linux (6.1)	1m 44s
Release builds / Release builds / Linux (5.10)	1m 30s
Release builds / Release builds / Linux (nightly-next)	2m 8s
Release builds / Release builds / Linux (nightly-main)	2m 8s
	30m 18s

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