fix: update Makefile for dotnet8-env (#431)

* fix: update Makefile for dotnet8-env

* fix: bump version for release

Author: davidchase

dotnet8/Makefile

@@ -8,7 +8,7 @@ all: dotnet8-env-img dotnet8-builder-img
 
 dotnet8-env-img: Dockerfile
 	@echo === Building image $(REPO)/dotnet8-env:$(TAG) using context $(CURDIR) and dockerfile $<
-	docker build --platform=$(PLATFORMS) -t $(REPO)/dotnet8-env:$(TAG) -f $< .
+	docker buildx build --platform=$(PLATFORMS) -t $(REPO)/dotnet8-env:$(TAG) $(DOCKER_FLAGS) -f $< .
 
 dotnet8-builder-img: builder/Dockerfile
 	@echo === Building image $(REPO)/dotnet8-builder:$(TAG) using context $(CURDIR) and dockerfile $<

dotnet8/envconfig.json

@@ -17,6 +17,6 @@
     "runtimeVersion": "8.0.0",
     "shortDescription": "Fission Dotnet 8.0.0 runtime uses Kestrel to host the internal web server. Supports both single file compilation (--code) and project-based compilation (--src).",
     "status": "Stable",
-    "version": "1.2.0"
+    "version": "1.3.0"
   }
 ]