Fix favicon.ico build bug and modify CI to run on PR (#479)

.github/workflows/dotnetcore.yml

@@ -1,6 +1,6 @@
 name: eShopOnWeb Build and Test
 
-on: [push]
+on: [push, pull_request, workflow_dispatch]
 
 jobs:
   build:
@@ -12,8 +12,10 @@ jobs:
     - name: Setup .NET Core
       uses: actions/setup-dotnet@v1
       with:
-        dotnet-version: 3.1.201
+        dotnet-version: 3.1.x
+
     - name: Build with dotnet
       run: dotnet build ./eShopOnWeb.sln --configuration Release
+    
     - name: Test with dotnet
       run: dotnet test ./eShopOnWeb.sln --configuration Release

eShopOnWeb.sln

@@ -25,6 +25,7 @@ Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "Solution Items", "Solution
 	ProjectSection(SolutionItems) = preProject
 		docker-compose.override.yml = docker-compose.override.yml
 		docker-compose.yml = docker-compose.yml
+		.github\workflows\dotnetcore.yml = .github\workflows\dotnetcore.yml
 		README.md = README.md
 	EndProjectSection
 EndProject