Release v1.5.2 on 2021-09-24.

1. b82cc77 jenkins.sh: simpler invocation of verify_value_string_... by Neels Hofmeyr · 6 years ago
2. e41ad4d jenkins: move make invocation into shared function by Max · 6 years ago
3. 229fa07 jenkins: use osmo-clean-workspace.sh before and after build by Neels Hofmeyr · 7 years ago
4. c8ef736 jenkins: bail early if $MAKE env var is not set by Neels Hofmeyr · 7 years ago
5. 754e687 fixups for recent "Cleanup jenkins build scripts" by Neels Hofmeyr · 7 years ago
6. 15b05fe Cleanup jenkins build scripts by Max · 7 years ago