Fixed: Set musl status at compile time

src/NzbDrone.Common/EnvironmentInfo/OsInfo.cs

@@ -97,16 +97,14 @@ namespace NzbDrone.Common.EnvironmentInfo
             }
             else
             {
-                return IsMusl() ? Os.LinuxMusl : Os.Linux;
+#if ISMUSL
+                return Os.LinuxMusl;
+#else
+                return Os.Linux;
+#endif
             }
         }
 
-        private static bool IsMusl()
-        {
-            var output = RunAndCapture("ldd", "/bin/ls");
-            return output.Contains("libc.musl");
-        }
-
         private static string RunAndCapture(string filename, string args)
         {
             Process p = new Process();

src/NzbDrone.Common/Readarr.Common.csproj

@@ -2,6 +2,7 @@
   <PropertyGroup>
     <TargetFrameworks>net462;netcoreapp3.1</TargetFrameworks>
     <NeutralLanguage>en</NeutralLanguage>
+    <DefineConstants Condition="'$(RuntimeIdentifier)' == 'linux-musl-x64' or '$(RuntimeIdentifier)' == 'linux-musl-arm64'">ISMUSL</DefineConstants>
   </PropertyGroup>
   <ItemGroup>
     <PackageReference Include="DotNet4.SocksProxy" Version="1.4.0.1" />