Setup Dependabot & CI/CodeQL workflows

.github/dependabot.yml

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+version: 2
+updates:
+
+  # Workflows
+  - package-ecosystem: github-actions
+    directory: /
+    schedule:
+      interval: monthly
+
+  # Project
+  - package-ecosystem: nuget
+    directory: /
+    schedule:
+      interval: monthly

.github/workflows/ci.yml

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+name: CI
+
+on:
+  push:
+    paths:
+      - 'Pages/**'
+      - 'Properties/**'
+      - 'wwwroot/**'
+      - '*.csproj'
+      - '*.json'
+      - '**/*.cs'
+      - '.github/workflows/ci.yml'
+    branches:
+      - '**'
+    tags:
+      - '*.*.*'
+  workflow_dispatch:
+
+env:
+  ARTIFACT_NAME: account-system
+
+jobs:
+  build:
+    name: Build
+    runs-on: ubuntu-22.04
+    permissions:
+      contents: read
+    steps:
+      - name: Clone repository
+        uses: actions/checkout@v3
+
+      - name: Setup .NET Core
+        uses: actions/setup-dotnet@v3
+        with:
+          dotnet-version: 7.0.x
+
+      - name: Restore dependencies
+        run: dotnet restore
+
+      - name: Build project
+        run: dotnet build --nologo --configuration Release --no-restore --no-self-contained
+
+      - name: Upload build artifact
+        uses: actions/upload-artifact@v3
+        with:
+          name: ${{ env.ARTIFACT_NAME }}
+          path: bin/Release/net7.0/*

.github/workflows/codeql.yml

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+name: CodeQL
+
+on:
+  push:
+    paths:
+     - '**'
+    branches:
+     - '**'
+  schedule:
+    - cron: '0 0 * * 0'
+
+jobs:
+  codeql:
+    name: CodeQL
+    runs-on: ubuntu-latest
+    permissions:
+      actions: read
+      contents: read
+      packages: read
+      security-events: write
+    steps:
+      - name: Clone repository
+        uses: actions/checkout@v3
+
+      - name: Initialize CodeQL
+        uses: github/codeql-action/init@v2
+        with:
+          languages: csharp
+
+      - name: Auto-build
+        uses: github/codeql-action/autobuild@v2
+
+      - name: Perform CodeQL analysis
+        uses: github/codeql-action/analyze@v2