linuxInstall.md: import key for openSUSE

[mati865]

Signed-off-by: Mateusz Mikula mati865@gmail.com

• Submitted a ticket for my issue if one did not already exist.
• Used Github auto-closing keywords in the commit message.
• Added/updated tests for this change (for new code or code which already has tests).
• Ran git rebase -i to squash commits (if needed).

Test Plan:

1. Without the key Brave installation fails with (you have to ignore missing dependency):

brave-0.14.1.x86_64.rpm:
    Header V4 RSA/SHA256 Signature, key ID 448eee6c: NOKEY
    V4 RSA/SHA256 Signature, key ID 448eee6c: NOKEY

brave-0.14.1-1.x86_64 (brave-rpm-release): Signature verification failed [4-Signatures public key is not available]

2. After adding the key it installs but you still have to ignore missing dependency.

[bsclifton]

++ thanks for the update 😄