chore: clean up github actions workflows

.github/workflows/dotnet.yml

@@ -0,0 +1,46 @@
+name: .net checks
+
+on:
+  push:
+    paths:
+    - .github/workflows/dotnet.yml
+    - 'Myriad/**'
+    - 'PluralKit.API/**'
+    - 'PluralKit.Bot/**'
+    - 'PluralKit.Core/**'
+  pull_request:
+    paths:
+    - .github/workflows/dotnet.yml
+    - 'Myriad/**'
+    - 'PluralKit.API/**'
+    - 'PluralKit.Bot/**'
+    - 'PluralKit.Core/**'
+
+jobs:
+  test:
+    name: 'run .net tests'
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v1
+      with:
+        submodules: recursive
+    - name: Setup .NET Core
+      uses: actions/setup-dotnet@v1
+      with:
+        dotnet-version: 8.0.x
+    - name: Run automated tests
+      run: dotnet test --configuration Release
+  dotnet-format:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout repo
+        uses: actions/checkout@v2
+
+      - name: Add dotnet-format problem matcher
+        uses: xt0rted/dotnet-format-problem-matcher@v1
+
+      - name: Restore dotnet tools
+        uses: xt0rted/dotnet-tool-restore@v1
+
+      - name: Run dotnet format
+        uses: PluralKit/dotnet-format@fix/net6