fix github patch url and update GPG pub key
- Add missing
.diff
suffix for github pr patch - Update outdated GPG key with
gpg --refresh-keys
error log:==> Verifying source file signatures with gpg... singularity-1.00.tar.gz ... FAILED (unknown public key A65B78DBE67C7AAC) ==> ERROR: One or more PGP signatures could not be verified! ==> ERROR: Could not download sources.