Compile several permutations of the shader in order to be able to switch them at runtime

Assets/ScriptableRenderLoop/HDRenderLoop/Sky/Resources/SkyHDRI.shader

             #pragma vertex Vert
             #pragma fragment Frag
 
+            #pragma multi_compile _ ATMOSPHERICS_OCCLUSION_FULLSKY
+            #pragma multi_compile _ ATMOSPHERICS_DEBUG
+
             #include "Color.hlsl"
             #include "Common.hlsl"
             #include "CommonLighting.hlsl"