Update build scripts

- Travis-ci: Distro has changed to Ubuntu bionic, Mono changed to 6.8.0 and dotnet sdk to 3.1.102
- Appveyor: image changed to VS2019
- PowerShell script: CakeVersion updated to 0.37.0
- Bash script: DOTNET_INSTALL_URL updated
- For both powershell and bash, there was a bug in regex that couldn't detect versions like x.x.x00.
- Cake: The project is using `dotnet test` command. `xunit` command replaced with `test` command and arguments chagned to match dotnet test command.

NancyFx#3007

.travis.yml

@@ -4,12 +4,12 @@ os:
   - osx
 
 sudo: required
-dist: trusty
+dist: bionic
 
 mono:
   - 6.8.0
 
-dotnet: 3.1.100
+dotnet: 3.1.102
 
 script:
   - ./build.sh --verbosity=minimal

appveyor.yml

@@ -1,4 +1,4 @@
-image: Visual Studio 2017
+image: Visual Studio 2019
 
 version: 2.0.0-ci000{build}
 configuration: Release

build.cake

@@ -280,13 +280,13 @@ Task("Test")
             }
 
             var settings = new ProcessSettings {
-                Arguments = string.Concat("xunit -configuration ", configuration, " -nobuild"),
+                Arguments = string.Concat("test --configuration ", configuration, " --no-build"),
                 WorkingDirectory = project.GetDirectory()
             };
 
             if (IsRunningOnUnix())
             {
-                settings.Arguments.Append(string.Concat("-framework ", netCoreTarget));
+                settings.Arguments.Append(string.Concat("--framework ", netCoreTarget));
             }
 
             Information("Executing tests for " + project.GetFilename() + " with arguments: " + settings.Arguments.Render());

build.ps1

@@ -1,5 +1,5 @@
-$CakeVersion = "0.24.0"
-$DotNetVersion = select-string -Path .\global.json -Pattern '[\d]\.[\d]\.[\d]' | % {$_.Matches} | % {$_.Value };
+$CakeVersion = "0.37.0"
+$DotNetVersion = select-string -Path .\global.json -Pattern '[\d]\.[\d]\.[\d]*' | % {$_.Matches} | % {$_.Value };
 $DotNetInstallerUri = "https://dot.net/v1/dotnet-install.ps1";
 
 # Make sure tools folder exists

build.sh

@@ -3,10 +3,10 @@
 # Define directories.
 SCRIPT_DIR=$PWD
 TOOLS_DIR=$SCRIPT_DIR/tools
-CAKE_VERSION=0.24.0
+CAKE_VERSION=0.37.0
 CAKE_DLL=$TOOLS_DIR/Cake.$CAKE_VERSION/Cake.exe
-DOTNET_VERSION=$(cat "$SCRIPT_DIR/global.json" | grep -o '[0-9]\.[0-9]\.[0-9]')
-DOTNET_INSTRALL_URI=https://raw.githubusercontent.com/dotnet/cli/v$DOTNET_VERSION/scripts/obtain/dotnet-install.sh
+DOTNET_VERSION=$(cat "$SCRIPT_DIR/global.json" | grep -o '[0-9]\.[0-9]\.[0-9]*')
+DOTNET_INSTRALL_URI=https://dot.net/v1/dotnet-install.sh
 
 # Make sure the tools folder exist.
 if [ ! -d "$TOOLS_DIR" ]; then