Start processes via exec

rootfs/etc/services.d/cron/run

@@ -1,4 +1,4 @@
 #!/usr/bin/with-contenv bash
 
 echo "starting cron"
-cron -f -L 15
+exec cron -f -L 15

rootfs/etc/services.d/influxdb/run

@@ -14,4 +14,4 @@ EOF
 fi
 
 echo "starting influxdb"
-influxd run
+exec influxd run

rootfs/etc/services.d/scrutiny/run

@@ -4,4 +4,4 @@ echo "waiting for influxdb"
 until $(curl --output /dev/null --silent --head --fail http://localhost:8086/health); do echo "influxdb not ready" && sleep 5; done
 
 echo "starting scrutiny"
-scrutiny start
+exec scrutiny start