Feature/ci cd modernization

.github/dependabot.yml

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+version: 2
+updates:
+  # .NET dependencies
+  - package-ecosystem: "nuget"
+    directory: "/"
+    schedule:
+      interval: "weekly"
+      day: "monday"
+      time: "06:00"
+    open-pull-requests-limit: 10
+    reviewers:
+      - "localstack-dotnet/maintainers"
+    assignees:
+      - "localstack-dotnet/maintainers"
+    commit-message:
+      prefix: "deps"
+      include: "scope"
+    groups:
+      # Group AWS SDK updates together
+      aws-sdk:
+        patterns:
+          - "AWSSDK.*"
+          - "AWS.*"
+      # Group Microsoft packages together
+      microsoft:
+        patterns:
+          - "Microsoft.*"
+          - "System.*"
+      # Group testing packages together
+      testing:
+        patterns:
+          - "xunit*"
+          - "*Test*"
+          - "coverlet*"
+          - "FluentAssertions*"
+      # Group build and tooling packages
+      build-tools:
+        patterns:
+          - "Cake.*"
+          - "GitVersion*"
+          - "Nuke.*"
+    ignore:
+      # Ignore patch updates for stable dependencies
+      - dependency-name: "Microsoft.Extensions.*"
+        update-types: ["version-update:semver-patch"]
+
+  # GitHub Actions dependencies
+  - package-ecosystem: "github-actions"
+    directory: "/"
+    schedule:
+      interval: "weekly"
+      day: "monday"
+      time: "06:00"
+    open-pull-requests-limit: 5
+    reviewers:
+      - "localstack-dotnet/maintainers"
+    commit-message:
+      prefix: "ci"
+      include: "scope"

.github/workflows/ci.yml

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+name: "CI/CD Pipeline"
+
+on:
+  push:
+    paths-ignore:
+      - "**.md"
+      - LICENSE
+    branches:
+      - "master"
+      - "feature/v2-preview1"
+      - "feature/ci-cd-modernization"
+  pull_request:
+    paths-ignore:
+      - "**.md"
+      - LICENSE
+    branches:
+      - master
+      - "feature/v2-preview1"
+
+env:
+  DOTNET_CLI_TELEMETRY_OPTOUT: true
+  DOTNET_SKIP_FIRST_TIME_EXPERIENCE: true
+  DOTNET_NOLOGO: true
+
+jobs:
+  build-and-test:
+    name: "Build & Test (${{ matrix.name }})"
+    runs-on: ${{ matrix.os }}
+
+    strategy:
+      fail-fast: false
+      matrix:
+        include:
+          # Windows: All frameworks including .NET Framework
+          - os: windows-latest
+            name: "Windows"
+            script: ".\build.ps1"
+            frameworks: "net8.0,net9.0,netstandard2.0,net472"
+
+          # Linux: .NET Core + Mono for Framework testing
+          - os: ubuntu-latest
+            name: "Linux"
+            script: "./build.sh"
+            frameworks: "net8.0,net9.0,netstandard2.0"
+
+          # macOS: .NET Core frameworks (most common usage)
+          - os: macos-latest
+            name: "macOS"
+            script: "./build.sh"
+            frameworks: "net8.0,net9.0,netstandard2.0"
+
+    steps:
+      - name: "Checkout"
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 0  # Full history for better caching
+
+      - name: "Setup .NET SDK"
+        uses: actions/setup-dotnet@v4
+        with:
+          dotnet-version: |
+            8.0.x
+            9.0.x
+
+      - name: "Make build script executable"
+        if: runner.os != 'Windows'
+        run: chmod +x ./build.sh
+
+      - name: "Cache NuGet packages"
+        uses: actions/cache@v4
+        with:
+          path: ~/.nuget/packages
+          key: ${{ runner.os }}-nuget-${{ hashFiles('**/packages.lock.json', '**/*.csproj', '**/Directory.Packages.props') }}
+          restore-keys: |
+            ${{ runner.os }}-nuget-
+
+      - name: "Build"
+        run: ${{ matrix.script }} --target build
+
+      - name: "Run Tests"
+        run: ${{ matrix.script }} --target tests --skipFunctionalTest false --exclusive
+
+      - name: "Publish Test Results"
+        uses: dorny/test-reporter@v1
+        if: success() || failure()
+        with:
+          name: 'Test Results (${{ matrix.name }})'
+          path: '**/*.trx'
+          reporter: 'dotnet-trx'
+          fail-on-error: true
+          max-annotations: 50
+
+      - name: "Upload Test Artifacts"
+        uses: actions/upload-artifact@v4
+        if: failure()
+        with:
+          name: test-results-${{ matrix.name }}
+          path: |
+            **/*.trx
+            **/TestResults/**/*
+          retention-days: 7