Use SIGKILL to actually kill the runner

.github/workflows/memcached.sh

@@ -1,14 +1,14 @@
 #!/bin/sh
 
 if [ -z "$GITHUB_WORKSPACE" ]; then
-	echo '$GITHUB_WORKSPACE is not set'
-	exit 1
+    echo '$GITHUB_WORKSPACE is not set'
+    exit 1
 fi
 
 if [ -z "$HOST_ROOT" ]; then
-	echo '$HOST_ROOT is not set'
-	exit 1
+    echo '$HOST_ROOT is not set'
+    exit 1
 fi
 
 chroot $HOST_ROOT make -C $GITHUB_WORKSPACE/memcached \
-	-j$(nproc) PARALLEL=$(nproc) test_tls
+    -j$(nproc) PARALLEL=$(nproc) test_tls