debug/collect-info: Include dump by goroutine leak detector.

Add a step to copy the goroutine leak detector stack dump (sigusr1) from
/persist/agentdebug/watcher/ to the collected output directory as
`goroutin-leak-detector-stacks-dump`, if present.

Signed-off-by: Nikolay Martyanov <nikolay@zededa.com>

pkg/debug/scripts/collect-info.sh

@@ -6,7 +6,7 @@
 
 # Script version, don't forget to bump up once something is changed
 
-VERSION=30
+VERSION=31
 # Add required packages here, it will be passed to "apk add".
 # Once something added here don't forget to add the same package
 # to the Dockerfile ('ENV PKGS' line) of the debug container,
@@ -457,6 +457,7 @@ ln -s /persist/log          "$DIR/persist-log"
 ln -s /persist/netdump      "$DIR/persist-netdump"
 ln -s /persist/kcrashes     "$DIR/persist-kcrashes"
 [ -d /persist/memory-monitor/output ] && ln -s /persist/memory-monitor/output "$DIR/persist-memory-monitor-output"
+[ -f /persist/agentdebug/watcher/sigusr1 ] && cp /persist/agentdebug/watcher/sigusr1 "$DIR/goroutin-leak-detector-stacks-dump"
 ln -s /run                  "$DIR/root-run"
 cp -r /sys/fs/cgroup/memory "$DIR/sys-fs-cgroup-memory" >/dev/null 2>&1
 [ -f /persist/SMART_details.json ] && ln -s /persist/SMART_details* "$DIR/"