[CI] do not add revision to version string if it's a tag build

extra/azure-pipelines/build-linux.yml

@@ -8,7 +8,8 @@ jobs:
       vmImage: ${{ parameters.vmImage }}
     variables:
       OPAMYES: 1
-      ADD_REVISION: 1
+      ${{ if not(startsWith(variables['Build.SourceBranch'], 'refs/tags/')) }}:
+        ADD_REVISION: 1
     steps:
       - checkout: self
         submodules: recursive

extra/azure-pipelines/build-mac.yml

@@ -8,7 +8,8 @@ jobs:
       vmImage: ${{ parameters.vmImage }}
     variables:
       OPAMYES: 1
-      ADD_REVISION: 1
+      ${{ if not(startsWith(variables['Build.SourceBranch'], 'refs/tags/')) }}:
+        ADD_REVISION: 1
     steps:
       - checkout: self
         submodules: recursive

extra/azure-pipelines/build-windows.yml

@@ -9,7 +9,8 @@ jobs:
       vmImage: ${{ parameters.vmImage }}
     variables:
       OPAMYES: 1
-      ADD_REVISION: 1
+      ${{ if not(startsWith(variables['Build.SourceBranch'], 'refs/tags/')) }}:
+        ADD_REVISION: 1
       CYG_MIRROR: http://mirrors.kernel.org/sourceware/cygwin/
       ${{ if eq(parameters.arch, '64') }}:
         ARCH: 64