feat(csharp-ci): upload the merged cobertura report as <prefix>-coverage-report

.github/workflows/csharp-ci.yaml

@@ -203,7 +203,7 @@ on:
       artifact-prefix:
         description: >-
           Prefix applied to per-run artifact names (coverage-percent,
-          ci-result-<shard>) to namespace them by language. Set a distinct
+          coverage-report, ci-result-<shard>) to namespace them by language. Set a distinct
           value per language when multiple CI workflows (e.g. csharp-ci and
           scala-ci) run as sibling jobs in the same caller run, so their
           run-level artifacts don't collide.
@@ -358,6 +358,16 @@ jobs:
             -f cobertura \
             "${cobertura_files[@]}"
 
+      - name: Upload merged cobertura report
+        if: ${{ matrix.coverage }}
+        uses: actions/upload-artifact@043fb46d1a93c77aae656e7c1c64a875d1fc6a0a # v7.0.1
+        with:
+          name: ${{ inputs.artifact-prefix }}-coverage-report
+          path: coverage/merged.cobertura.xml
+          if-no-files-found: error
+          retention-days: 1
+          overwrite: true
+
       - name: Extract coverage percentage
         if: ${{ matrix.coverage }}
         working-directory: ${{ github.workspace }}

CHANGELOG.md

@@ -7,6 +7,10 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+### Added
+
+- `csharp-ci.yaml`'s coverage shard uploads the merged Cobertura report (`coverage/merged.cobertura.xml`, the file `dotnet-coverage merge` produces from every per-project report) as the run artifact `<artifact-prefix>-coverage-report` (default `csharp-coverage-report`), with `retention-days: 1`. A caller job that `needs` the `csharp-ci` job can download it with `actions/download-artifact` to run checks over the whole-solution coverage, such as asserting that every source module appears in it, without re-running the tests. The name shares the `artifact-prefix` namespace with `<prefix>-coverage-percent` and `<prefix>-ci-result-*` and matches neither, and it differs from `scala-ci.yaml`'s `coverage-artifact-name` (default `scala-coverage`, which already uploads its Cobertura file), so sibling csharp and scala jobs in one caller run do not collide. Purely additive: no input or output changes.
+
 ## [2.5.0] - 2026-09-29
 
 ### Added

README.md

@@ -120,6 +120,14 @@ Produces a Cobertura coverage report, a markdown summary, and a sticky
 PR comment with per-project coverage. Uploads `.nupkg` artifacts when
 `pack: true`.
 
+The coverage shard also uploads the merged Cobertura report
+(`coverage/merged.cobertura.xml`) as the run artifact
+`<artifact-prefix>-coverage-report` (default `csharp-coverage-report`, kept
+for one day), so a downstream caller job can download it and check
+whole-solution coverage without re-running the tests. Other run artifacts
+under the same prefix: `<artifact-prefix>-coverage-percent` and
+`<artifact-prefix>-ci-result-<shard>`.
+
 A configurable matrix runs build + test across one or several runners. The
 simple `os-list` form takes a JSON array of runner labels (Linux / macOS /
 Windows) and runs coverage on the `ubuntu-latest` shard. For finer control —