Fix build workflow

 - Downgrade Ubuntu
 - Tweak NuGet workarounds

.github/workflows/build.yaml

@@ -10,7 +10,7 @@ on:
 
 jobs:
   build:
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-22.04
     steps:
       - name: Checkout
         uses: actions/checkout@v4
@@ -25,16 +25,15 @@ jobs:
         id: bepinexversion
         run: echo "bepinexversion=$(./scripts/get-dep-version.sh denikson-BepInExPack_Valheim)" >> $GITHUB_OUTPUT
 
+      - name: Create NuGet config path
+        # If we don't make this in advance, NuGet will somehow initialize it in a way that makes it unreadable to NuGet.  :shrug:
+        run: mkdir -p ~/.config/NuGet/ && touch ~/.config/NuGet/NuGet.Config
+
       - name: Get build commands
         run: scripts/install-linux-tools.sh
 
       - name: Install NuGet dependencies
-        run: |
-          # Fixes weird permission errors that started in GitHub Actions
-          # environments on June 14th:
-          sudo chown -R $USER /tmp/NuGetScratch/
-
-          nuget restore Pokeheim.sln
+        run: nuget restore Pokeheim.sln
 
       - name: Cache Valheim
         id: cachevalheim