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Check this out for backend: https://postgis.net/docs/ST_AsMVT.html if you can run ogr2ogr to import your data into PostGIS, and serve the binary data returned by a query, you're all set. You literally only need PostGIS for a dynamic vector tile service.

Then mapboxgl or libremapjs on the frontend, or even OpenLayers.

So to get it straight:

OSM.pbf file -> ogr2ogr -> PostGIS?

I currently use a .mbtiles file and plug it into tileserver-gl, but i guess in theory you could just import OSM to PostGIS and then add the PostGIS as a source in tileserver-gl? That would be amazing

Yes, just use tippecanoe to create your tiles, and serve them up via s3 or howerver else you want. Then client side render them with maplibregl

The article covers that. See the "maplibre-gl-js for client-side rendering" section.