Fix SSH key handling in CI workflow to ensure proper permissions and prevent access issues

Author: 0x25CBFC4F

.github/workflows/test.yml

@@ -31,7 +31,9 @@ jobs:
         eval $(ssh-agent -s)
         echo "SSH_AUTH_SOCK=$SSH_AUTH_SOCK" >> $GITHUB_ENV
         echo "SSH_AGENT_PID=$SSH_AGENT_PID" >> $GITHUB_ENV
-        ssh-add NullOpsDevs.LibSsh.Test/docker/test-keys/id_rsa
+        cp NullOpsDevs.LibSsh.Test/docker/test-keys/id_rsa /tmp/id_rsa
+        chmod 600 /tmp/id_rsa
+        ssh-add /tmp/id_rsa
 
     - name: Build test project (Release)
       run: dotnet build -c Release --self-contained -r linux-x64 ./NullOpsDevs.LibSsh.Test/NullOpsDevs.LibSsh.Test.csproj