Get list of equidistant points on polygon border PostGIS

I would like to get points from polygon border using PostGIS.

I’ve tried using ST_DumpPoints() function, like this:

CREATE OR REPLACE FUNCTION get_points_from_polygon(polygon geometry)
RETURNS SETOF geometry AS
$$
DECLARE
    point geometry;
BEGIN
    FOR point IN 
        SELECT DISTINCT 
            points.geom 
        FROM (
               SELECT (ST_DumpPoints(polygon)).* 
             ) AS points LOOP
        RETURN NEXT point;
    END LOOP;
END;
$$
LANGUAGE plpgsql ;

But it gets sometimes huge list of points (~100-500) and that is not what I need.
I need to get N equidistant points on the border, like on the screenshot attached.
Then, when I have these points I will analyze viewshed polygons from point as observer

I’ve found, how to identify is the point on the polygon border
But have no idea , how to create first them and get as a list of points geometry.

What would be your suggestion to do this?

WITH tbla AS (SELECT (ST_ExteriorRing(((ST_Dump(geom)).geom))) geom FROM <table_name>), intervals AS (SELECT generate_series (0, 99) as steps) SELECT steps AS stp, ST_LineInterpolatePoint(geom, steps/(SELECT count(steps)::float-1 FROM intervals)) geom FROM tbla, intervals GROUP BY intervals.steps, geom;

WITH shell AS (
  SELECT ST_ExteriorRing('POLYGON ((5 5, 10 15, 17 10, 5 5))') geom
)
SELECT i, ST_LineInterpolatePoint(geom, (i-1.0)/40) pt
    FROM shell
    JOIN generate_series (1, 40) AS step(i) ON true;