Explicitely set uploaded image ACLs for S3 to "public-read"
Explicitely set uploaded image ACLs for S3 to "public-read"

This works around permission problems with DigitalOcean spaces (where
files are always *private* by default).

This should not pose a difference with AWS and other providers as CodiMD
only works with public S3 assets either way.

Signed-off-by: Martin Honermeyer <bcc4d4f0381c74919db335641dc13b085bf1d0fd@strahlungsfrei.de>

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