Freeradius: raddb/certs/bootstrap creates server-unreadable key files in absence of make

When using raddb/certs/bootstrap in Alpine 3.10 OpenSSL appear to create keys with owner-only permissions. The radiusd fails to start with the following message: tls: Failed reading certificate file "/etc/raddb/certs/server.pem" tls: error:0200100D:system library:fopen:Permission denied

There is a related issue in the uptream project https://github.com/FreeRADIUS/freeradius-server/issues/2223 but it seems only the raddb/certs/Makefile was fixed and not the bootstrap script

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