feat(jigasi): support graceful shutdown via sidecar (#1908)

jigasi/rootfs/etc/services.d/jigasi/finish

@@ -0,0 +1,9 @@
+#!/usr/bin/with-contenv bash
+
+# When the jigasi is shutdown (or gracefully shutdown), it exits with code 0.
+# In this case, we don't want S6 to restart the service. We want to stop all
+# services and shutdown the container.
+
+if [[ $1 -eq 0 ]]; then
+  /opt/jitsi/shutdown.sh
+fi

jigasi/rootfs/opt/jitsi/shutdown.sh

@@ -0,0 +1,11 @@
+#!/usr/bin/with-contenv bash
+
+if [ -n "$AUTOSCALER_URL" ]; then
+    # notify the sidecar of imminent shutdown
+    PORT=${AUTOSCALER_SIDECAR_PORT:-6000}
+    curl -d '{}' -v 0:$PORT/hook/v1/shutdown
+    sleep 10
+fi
+
+# shutdown everything
+s6-svscanctl -t /var/run/s6/services