add 9 and 8

Author: danmoseley

src/dotnetaspire/devcontainer-feature.json

@@ -17,8 +17,9 @@
         },
     },
     "dependsOn": {
-        // how to ensure the correct .NET version is installed? seems it would require using onCreateCommand
-        // to write out a temporary devcontainer.json. For now, it's fixed at 9.0
-        "ghcr.io/devcontainers/features/dotnet": "9.0"
+        "ghcr.io/devcontainers/features/dotnet": {
+            "version": "8.0",
+            "additionalVersions": "9.0"
+        }
     }
 }

test/dotnetaspire/test.sh

@@ -17,6 +17,12 @@ source dotnet_env.sh
 check "dotnet is installed in DOTNET_ROOT and execute permission is granted" \
 test -x "$DOTNET_ROOT/dotnet" 
 
+check "dotnet 8.0 is installed" \
+test "$($DOTNET_ROOT/dotnet --info | grep '8.0.')"
+
+check "dotnet 9.0 is installed" \
+test "$($DOTNET_ROOT/dotnet --info | grep '9.0.')"
+
 check "dotnetaspire templates are installed" \
 test "$DOTNET_ROOT/dotnet new aspire"