fixed release version in pipeline

.gitea/workflows/release.yml

@@ -1,5 +1,6 @@
-# The release: a tag of the form v1.2.3.0 builds the solution, runs the tests
-# and packs the MSIX with the version taken from the tag.
+# The release: a tag of the form v1.2.3 builds the solution, runs the tests and
+# packs the MSIX with the version taken from the tag — three numbers of the tag
+# and a zero the Store keeps for itself.
 #
 # The same requirements to the runner as in pull-request.yml apply: Windows, the
 # .NET 10 SDK and an interactive desktop session for the tests. makeappx comes
@@ -58,20 +59,23 @@ jobs:
               throw "Git LFS left pointers instead of files: $($pointers -join ', ')."
           }
 
-      # The tag is the only place the version comes from: the Store takes four
-      # numbers ending in zero, so anything else is stopped here rather than
-      # halfway through the packaging
+      # The tag is the only place the version comes from, and it is a plain
+      # version of three numbers — the same shape the application itself looks
+      # for in the releases when it checks for an update. A tag of any other
+      # shape is stopped here rather than halfway through the packaging
       - name: Read the version from the tag
         id: version
         run: |
           $ErrorActionPreference = 'Stop'
           $tag = '${{ github.ref_name }}'
 
-          if ($tag -notmatch '^v\d+\.\d+\.\d+\.0$') {
-              throw "The tag '$tag' does not fit: a release is tagged as v1.2.3.0 — four numbers ending in zero."
+          if ($tag -notmatch '^v\d+\.\d+\.\d+$') {
+              throw "The tag '$tag' does not fit: a release is tagged as v1.2.3 — three numbers. A fourth one does not belong in the tag: the Store keeps the revision for itself, and the package always gets a zero there."
           }
 
-          "version=$($tag.Substring(1))" | Out-File $env:GITHUB_OUTPUT -Append -Encoding utf8
+          # The package takes four numbers with a zero at the end: the Store
+          # reserves the last one, so it carries nothing the tag could tell
+          "version=$($tag.Substring(1)).0" | Out-File $env:GITHUB_OUTPUT -Append -Encoding utf8
 
       - name: Show the toolchain
         run: dotnet --info