Add GitHub workflows

.github/workflows/build.yml

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+name: Build
+
+on:
+  push:
+    branches: [ main ]
+  pull_request:
+    branches: [ main ]
+  workflow_dispatch:
+
+permissions:
+  contents: read
+
+jobs:
+  build:
+    runs-on: windows-2022
+    steps:
+    - uses: actions/checkout@v3
+    - name: Setup dotnet
+      uses: actions/setup-dotnet@v3
+      with:
+        dotnet-version: |
+          7.0.x
+    - name: Build
+      run: |
+        dotnet build app/GHelper.sln

.github/workflows/codeql.yml

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+name: CodeQL
+
+on:
+  push:
+    branches: [ main ]
+  pull_request:
+    branches: [ main ]
+  schedule:
+  - cron: '34 18 * * 3'
+
+permissions:
+  actions: read
+  contents: read
+  security-events: write
+
+jobs:
+  codeql:
+    runs-on: windows-2022
+    steps:
+    - uses: actions/checkout@v3
+    - name: Initialize CodeQL
+      uses: github/codeql-action/init@v2
+      with:
+        languages: c#
+    - name: Autobuild
+      uses: github/codeql-action/autobuild@v2
+    - name: Analyze
+      uses: github/codeql-action/analyze@v2

.github/workflows/release.yml

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+name: Release
+
+on:
+  release:
+    types: [ published ]
+
+permissions:
+  contents: write
+
+jobs:
+  release:
+    runs-on: windows-2022
+    steps:
+    - uses: actions/checkout@v3
+    - name: Setup dotnet
+      uses: actions/setup-dotnet@v3
+      with:
+        dotnet-version: |
+          7.0.x
+    - name: Publish
+      run: |
+        dotnet publish app/GHelper.sln --configuration Release --runtime win-x64 -p:PublishSingleFile=true --no-self-contained
+        powershell Compress-Archive app/bin/x64/Release/net7.0-windows8.0/win-x64/publish/GHelper.exe GHelper.zip
+    - name: Upload
+      env:
+        GH_TOKEN: ${{ github.token }}
+      run: |
+        gh release upload ${{ github.ref_name }} app/bin/x64/Release/net7.0-windows8.0/win-x64/publish/GHelper.exe GHelper.zip