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With this Bootstrap icons css link

<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/[email protected]/font/bootstrap-icons.css">

and font name bootstrap-icons it worked:

var image_style_warning = new ol.style.Style({
  text: new ol.style.Text({
    text: '\uf220',
    fill: new ol.style.Fill({color: 'red'}),
    stroke: new ol.style.Stroke({color: 'yellow', width: 1}),
    font: '100px bootstrap-icons'
  })
});

Here is the result: