fix(ci): use explicit SSH config for AUR sync

Author: OneNoted

.github/workflows/aur-taskers-bin.yml

@@ -73,7 +73,15 @@ jobs:
           install -dm700 ~/.ssh
           printf '%s\n' "$AUR_SSH_PRIVATE_KEY" > ~/.ssh/id_ed25519
           chmod 600 ~/.ssh/id_ed25519
-          ssh-keyscan aur.archlinux.org >> ~/.ssh/known_hosts
+          ssh-keyscan -H aur.archlinux.org >> ~/.ssh/known_hosts
+          cat > ~/.ssh/config <<CFG
+          Host aur.archlinux.org
+            IdentityFile ~/.ssh/id_ed25519
+            IdentitiesOnly yes
+            StrictHostKeyChecking accept-new
+            UserKnownHostsFile ~/.ssh/known_hosts
+          CFG
+          chmod 600 ~/.ssh/config
 
       - name: Clone AUR package repo
         shell: bash