refactor: Build/Test Workflows

This breaks apart our build/test workflows to make them reusable. With the
aim of being able to reduce deplication, improve maintainability, and efficiency
of how the workflows run.

.github/workflows/build.yml

@@ -33,4 +33,3 @@ jobs:
           name: ${{ inputs.configuration }}-out
           path: _build/out/
           retention-days: 1
-      - run: echo "${{ toJson(github) }}"

.github/workflows/test.yml

@@ -34,6 +34,10 @@ jobs:
       - uses: actions/checkout@v4
       - name: Install runtime dependencies
         run: apt-get install -y xvfb
+      - name: Setup .NET Core
+        uses: actions/setup-dotnet@v4
+        with:
+          dotnet-version: '7'
       - uses: actions/download-artifact@v4
         with:
           name: Debug-out
@@ -49,6 +53,7 @@ jobs:
     needs: build-release
     runs-on: ubuntu-latest
     steps:
+      - uses: actions/checkout@v4
       - uses: actions/download-artifact@v4
         with:
           name: Release-repack-unsigned