Add branch name to branch builds

Author: eddymoulton

.github/workflows/ci.yml

@@ -84,12 +84,20 @@ jobs:
         uses: actions/setup-dotnet@v5.2.0
         with:
           dotnet-version: 9.0.x
+      - name: Compute version suffix for branch builds
+        if: ${{ !startsWith(github.ref, 'refs/tags/') }}
+        id: version
+        run: |
+          # Sanitize branch name: lowercase, replace non-alphanumeric with hyphen, trim to 20 chars
+          BRANCH="${GITHUB_HEAD_REF:-${GITHUB_REF_NAME}}"
+          SAFE_BRANCH=$(echo "$BRANCH" | tr '[:upper:]' '[:lower:]' | sed 's/[^a-z0-9]/-/g' | sed 's/--*/-/g' | sed 's/^-//' | sed 's/-$//' | cut -c1-20)
+          echo "override=${SAFE_BRANCH}.${{ github.run_number }}" >> "$GITHUB_OUTPUT"
       - name: Download artifacts
         uses: actions/download-artifact@v8.0.1
         with:
           path: nuget.package/runtimes/
       - name: Create package
-        run: dotnet pack nuget.package
+        run: dotnet pack nuget.package ${{ steps.version.outputs.override && format('/p:MinVerDefaultPreReleaseIdentifiers="{0}"', steps.version.outputs.override) || '' }}
       - name: Upload NuGet package
         uses: actions/upload-artifact@v7.0.0
         with: