Discover solution file explicitly in Stage 2 (Windows)

[Chris-Wolfgang]

Summary

Replaces bare dotnet restore / dotnet build --no-restore in Stage 2 with explicit solution discovery via git ls-files. Fixes failures across two related symptoms.

Problem

Stage 2's restore/build steps run from the repo root with no solution argument. dotnet then has to guess what to build, which fails in two real scenarios:

Symptom	Affected repo example	Reason
MSB1003: Specify a project or solution file	console-app-template	Solution lives in a subfolder (src/ConsoleAppTemplate.sln); repo root has nothing
MSB1011: Specify which project or solution file to use	IEquatable-Extensions	Two solution files at root (IEquatable Extensions.slnx + Solution.slnx)

Fix

Discover the solution file before running dotnet:

sln=$(git ls-files '*.slnx' | head -1)
[ -z "$sln" ] && sln=$(git ls-files '*.sln' | head -1)
if [ -n "$sln" ]; then
  dotnet restore "$sln"
else
  echo "ℹ️  No solution file found — falling back to bare 'dotnet restore'."
  dotnet restore
fi

Preference order:

• .slnx (newer XML-based format) before .sln
• Among multiple candidates of the same extension: alphabetically-first via head -1 (git emits in sorted order, so this naturally prefers root-level over nested when extensions match)
• Fall back to bare dotnet restore only if no solution exists at all (the build still has to fail loudly in that case — there is no sensible default)

Same logic in both Restore dependencies and Build solution steps.

shell: bash is set explicitly because Windows runners default to pwsh, but bash quoting around space-containing solution names (e.g. IEquatable Extensions.slnx) is more reliable.

Subsumes

IEquatable-Extensions #61 — the per-repo fix for MSB1011. Once this template change propagates, that PR can be closed.

Test plan

• Verify Stage 2 passes on a normal repo with a single root-level .slnx
• Verify Stage 2 passes on console-app-template (nested solution)
• Verify Stage 2 passes on IEquatable-Extensions (multiple solutions)

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