feat: add more build variables

Author: BenjaminMichaelis

IntelliTect.Multitool/Build/IntelliTect.Multitool.targets

@@ -1,8 +1,19 @@
 <Project>
     <PropertyGroup Label="CI" Condition="'$(CI)' == ''">
       <CI>false</CI>
-      <!-- GH, CircleCI, GitLab and BitBucket already use CI -->
-      <CI Condition="'$(TF_BUILD)' == 'true' or                       '$(TEAMCITY_VERSION)' != '' or                       '$(APPVEYOR)' != '' or                       '$(BuildRunner)' == 'MyGet' or                       '$(JENKINS_URL)' != '' or                       '$(TRAVIS)' == 'true' or                       '$(BUDDY)' == 'true' or                      '$(CODEBUILD_CI)' == 'true'">true</CI>
+      <!-- Explicit checks for platforms that typically set CI themselves, but included for robustness -->
+      <CI Condition="'$(GITHUB_ACTIONS)' == 'true' or
+                     '$(GITLAB_CI)' == 'true' or
+                     '$(CIRCLECI)' == 'true' or
+                     '$(CONTINUOUS_INTEGRATION)' == 'true' or
+                     '$(TF_BUILD)' == 'true' or
+                     '$(TEAMCITY_VERSION)' != '' or
+                     '$(APPVEYOR)' != '' or
+                     '$(BuildRunner)' == 'MyGet' or
+                     '$(JENKINS_URL)' != '' or
+                     '$(TRAVIS)' == 'true' or
+                     '$(BUDDY)' == 'true' or
+                     '$(CODEBUILD_CI)' == 'true'">true</CI>
     </PropertyGroup>
 
     <ItemGroup Condition="('$(CI)' == 'true' AND '$(Deterministic)' != 'true' AND '$(ReleaseDateAttribute)' != 'true') OR '$(ReleaseDateAttribute)' == 'true'">