Split out rekey test since it runs the longest.

.github/configs

@@ -161,16 +161,17 @@ case "$config" in
 	export TEST_SSH_ELAPSED_TIMES
 	# Valgrind slows things down enough that the agent timeout test
 	# won't reliably pass, and the unit tests run longer than allowed
-	# by github so split into three separate tests.
-	tests2="rekey integrity try-ciphers"
+	# by github so split into separate tests.
+	tests2="integrity try-ciphers"
 	tests3="krl forward-control sshsig agent-restrict kextype sftp"
 	tests4="cert-userkey cert-hostkey kextype sftp-perm keygen-comment percent"
+	tests5="rekey"
 	case "$config" in
 	    valgrind-1)
 		# All tests except agent-timeout (which is flaky under valgrind)
 		# and hostbased (since valgrind won't let ssh exec keysign).
 		# Slow ones are run separately to increase parallelism.
-		SKIP_LTESTS="agent-timeout hostbased ${tests2} ${tests3} ${tests4}"
+		SKIP_LTESTS="agent-timeout hostbased ${tests2} ${tests3} ${tests4} ${tests5}"
 		;;
 	    valgrind-2)
 		LTESTS="${tests2}"
@@ -181,6 +182,9 @@ case "$config" in
 	    valgrind-4)
 		LTESTS="${tests4}"
 		;;
+	    valgrind-5)
+		LTESTS="${tests5}"
+		;;
 	    valgrind-unit)
 		TEST_TARGET="unit USE_VALGRIND=1"
 		;;

.github/workflows/c-cpp.yml

@@ -24,6 +24,7 @@ jobs:
           - { os: ubuntu-20.04, configs: valgrind-2 }
           - { os: ubuntu-20.04, configs: valgrind-3 }
           - { os: ubuntu-20.04, configs: valgrind-4 }
+          - { os: ubuntu-20.04, configs: valgrind-5 }
           - { os: ubuntu-20.04, configs: valgrind-unit }
           - { os: ubuntu-20.04, configs: c89 }
           - { os: ubuntu-20.04, configs: clang-6.0 }