runconfig: enalbe ssh client ssh-rsa sha1 signature algorithm

Newer versions of openssh client disables ssh-rsa sha1 public key
signature algorithm.

Unfortunately gitea ssh server requires this signature algorithm instead
of using the stronger rsa-sha2-256/rsa-sha2-512 (see
go-gitea/gitea#17798)

So, as a temporary workaround, force enable on the ssh client the
ssh-rsa sha1 signature algorithm.

internal/runconfig/runconfig.go

@@ -109,6 +109,7 @@ Host $AGOLA_GIT_HOST
 	Port $AGOLA_GIT_PORT
 	StrictHostKeyChecking ${STRICT_HOST_KEY_CHECKING}
 	PasswordAuthentication no
+	PubkeyAcceptedAlgorithms +ssh-rsa
 EOF
 )