chore(ci): split ci/build

Windows builds need to run on Windows runners, so if we can't matrix-ify build then this is more organized anyway.

.github/workflows/build.yml

@@ -0,0 +1,25 @@
+name: Build
+on: [push, pull_request]
+
+jobs:
+  windows:
+    name: Windows
+    runs-on: windows-latest
+
+    steps:
+    - uses: actions/checkout@v3
+    - uses: actions/setup-dotnet@v3
+      with:
+        dotnet-version: 7.0
+    
+    - name: Build
+      run: |
+        dotnet publish -r win-x64 -c Release --no-self-contained -p:PublishDir=../publish/win-x64
+        mv publish/win-x64/Kiseki.Launcher.Windows.exe publish/win-x64/Kiseki.Launcher.exe
+        mv publish/win-x64/Kiseki.Launcher.Windows.pdb publish/win-x64/Kiseki.Launcher.pdb
+    
+    - name: Upload
+      uses: actions/upload-artifact@v3
+      with:
+        name: win-x64
+        path: publish/win-x64/*

.github/workflows/ci.yml

@@ -2,31 +2,8 @@ name: CI
 on: [push]
 
 jobs:
-  build:
-    name: Build
-    runs-on: ubuntu-latest
-
-    steps:
-    - uses: actions/checkout@v3
-    - uses: actions/setup-dotnet@v3
-      with:
-        dotnet-version: 7.0
-    
-    - name: Build
-      run: |
-        dotnet publish -r win-x64 -c Release --no-self-contained -p:PublishDir=../publish/win-x64
-        mv publish/win-x64/Kiseki.Launcher.Windows.exe publish/win-x64/Kiseki.Launcher.exe
-        mv publish/win-x64/Kiseki.Launcher.Windows.pdb publish/win-x64/Kiseki.Launcher.pdb
-    
-    - name: Upload
-      uses: actions/upload-artifact@v3
-      with:
-        name: win-x64
-        path: publish/win-x64/*
-  
   release:
     name: Release
-    needs: build
     runs-on: ubuntu-latest
     if: startsWith(github.ref, 'refs/tag/v')