Convert RGB to rgba(Red, Green, Blue, Opacity) HTML/CSS format

color:rgb_to_rgba(INT $red, INT $green, INT $blue, FLOAT $opacity=1)

color:rgb_to_rgba(11, 124, 124)
#=> "rgba(11, 124, 124, 1)"

color:rgb_to_rgba(11, 100, 24, .5)
#=> "rgba(11, 100, 24, 0.5)"

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