Update appveyor.yml

appveyor.yml

@@ -1,12 +1,8 @@
 image: Previous Visual Studio 2019
 
-init:
-    -   cmd: git config --global core.autocrlf true
-    -   elsa_build_version = "1.1.1"
-
 environment:
     elsa_version: 2.3.0
-    # elsa_build_version: 0.0.0
+    elsa_build_version: 0.0.0
     nodejs_version: "14.6.0"
     # AppVeyor installs Java on its build agents by default, but it
     # picks an old version that's not compatible with SonarQube.
@@ -17,7 +13,19 @@ environment:
     sonarcloud_api_key:
         secure: qaE9kOVkGGFM7ZMf3YeliZxDU9udTCy6W5xXHJ9T+tXv5qXPMYlIdR7hyNgxW04A
 
-version: ${elsa_build_version}
+init:
+    -   cmd: git config --global core.autocrlf true
+    -   ps: |
+            if ($env:APPVEYOR_REPO_TAG -eq "true")
+            {
+                $env:elsa_build_version=$env:APPVEYOR_REPO_TAG_NAME
+            }
+            else
+            {
+                $env:elsa_build_version="$($env:elsa_version)-preview.$($env:APPVEYOR_BUILD_NUMBER)"
+            }
+
+version: 2.3.0-preview.{build}
 
 pull_requests:
     do_not_increment_build_number: true