If you have a license to Bigfix LifeCycle, I believe you could do something like this through the Server Automation dashboard as well. I haven’t used it myself, but if I recall you can set up a schedule to “Deploy all baselines from custom site”. You still have to keep the baselines up-to-date, but don’t have to send Actions for each.
It is really not advisable to automatically deploy all new content. You should review each first, as there are often several options when choosing fixlets (ie. Monthly Security-Only, Monthly cumulative rollup, etc) and sometimes even contradictory actions (like “Enable Workaround” and “Disable Workaround” fixlets published together).