When acme.sh is run as a non-root user different from the owner of the
webroot directory it is unable to change the owner of the files in
.well-known to that user, causing permissions errors. Avoid this by
making the files world-readable.
These files should pose no disclosure risk since they are sent in
cleartext during the HTTP Identifier Validation Challenge[1] and may
already be exposed by directory enumeration, depending on server
settings. AFAIK they should be safe to expose as world-readable in all
cases.
1. https://ietf-wg-acme.github.io/acme/#rfc.section.7.2FixesNeilpang/acme.sh#32
Signed-off-by: Kevin Locke <kevin@kevinlocke.name>
