[Test] use the coverage collector in tests

test/functional/configs/clickhouse.conf

@@ -56,6 +56,7 @@ worker {
         secure_ip = ["127.0.0.1", "::1"];
         stats_path = "${TMPDIR}/stats.ucl"
 }
+lua = "${TESTDIR}/lua/test_coverage.lua";
 modules {
     path = "${TESTDIR}/../../src/plugins/lua/"
 }

test/functional/configs/lua_test.conf

@@ -47,5 +47,5 @@ worker {
 	secure_ip = ["127.0.0.1", "::1"];
 	stats_path = "${TMPDIR}/stats.ucl"
 }
-
+lua = "${TESTDIR}/lua/test_coverage.lua";
 lua = ${LUA_SCRIPT};

test/functional/configs/plugins.conf

@@ -507,5 +507,6 @@ worker {
 modules {
     path = "${TESTDIR}/../../src/plugins/lua/"
 }
+lua = "${TESTDIR}/lua/test_coverage.lua";
 lua = "${INSTALLROOT}/share/rspamd/rules/rspamd.lua"
 ${PLUGIN_CONFIG}