Add GitHub Action

.github/workflows/CI-CD.yml

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+name: "Build, Test and Pack"
+
+on:
+  push:
+    branches: [ master ]
+  pull_request:
+    branches: [ master ]
+jobs:
+  event_file:
+    name: "Event File"
+    runs-on: ubuntu-latest
+    steps:
+    - name: Upload
+      uses: actions/upload-artifact@3cea5372237819ed00197afe530f5a7ea3e805c8 # v3.1.0
+      with:
+        name: Event File
+        path: ${{ github.event_path }}
+
+  build-and-test:
+    name: "Build and Test"
+    strategy:
+      matrix:
+        os: [windows-latest, ubuntu-latest]
+    runs-on: ${{ matrix.os }}
+
+    steps:
+    - name: Checkout
+      uses: actions/checkout@2541b1294d2704b0964813337f33b291d3f8596b # v3.0.2
+      with:
+        fetch-depth: '0'
+
+    - name: Install .NET Core
+      uses: actions/setup-dotnet@c0d4ad69d8bd405d234f1c9166d383b7a4f69ed8 # v2.1.0
+      with:
+        dotnet-version: 6.0.x
+
+    - name: Build
+      run: dotnet build --configuration Release source/icu.net.sln
+
+    - name: Test
+      run: dotnet test --configuration Release --no-build source/icu.net.sln -- NUnit.TestOutputXml=TestResults
+
+    - name: Upload Test Results
+      if: always()
+      uses: actions/upload-artifact@3cea5372237819ed00197afe530f5a7ea3e805c8 # v3.1.0
+      with:
+        name: Test Results (${{matrix.os}})
+        path: "**/TestResults/*.xml"
+
+    - name: Pack
+      run: dotnet pack --configuration Release --no-build --include-symbols source/icu.net.sln
+
+    - name: Upload Artifacts
+      uses: actions/upload-artifact@3cea5372237819ed00197afe530f5a7ea3e805c8 # v3.1.0
+      with:
+        name: icu-dotnet-nugetpackage
+        path: |
+          output/*.nupkg
+          output/*.snupkg
+      if: matrix.os == 'ubuntu-latest'
+
+  publish-nuget:
+    name: "Publish NuGet package"
+    runs-on: ubuntu-latest
+    needs: build-and-test
+    if: github.event_name == 'push'
+    steps:
+    - name: Download Artifacts
+      uses: actions/download-artifact@fb598a63ae348fa914e94cd0ff38f362e927b741 # v3.0.0
+      with:
+        path: artifacts
+
+    - name: Publish to Nuget
+      run: dotnet nuget push artifacts/*.*nupkg -s https://api.nuget.org/v3/index.json -k ${{secrets.SILLSDEV_PUBLISH_NUGET_ORG}} --skip-duplicate

.github/workflows/test-results.yml

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+# see https://github.com/marketplace/actions/publish-test-results#support-fork-repositories-and-dependabot-branches
+# why this file exists
+name: Test Results
+
+on:
+  workflow_run:
+    workflows: ["Build, Test and Pack"]
+    types:
+      - completed
+
+jobs:
+  test-results:
+    name: Test Results
+    runs-on: ubuntu-latest
+    if: github.event.workflow_run.conclusion != 'skipped'
+
+    permissions:
+      checks: write
+      pull-requests: write
+
+    steps:
+      - name: Download and Extract Artifacts
+        env:
+          GITHUB_TOKEN: ${{secrets.GITHUB_TOKEN}}
+        run: |
+           mkdir -p artifacts && cd artifacts
+
+           artifacts_url=${{ github.event.workflow_run.artifacts_url }}
+
+           gh api "$artifacts_url" -q '.artifacts[] | [.name, .archive_download_url] | @tsv' | while read artifact
+           do
+             IFS=$'\t' read name url <<< "$artifact"
+             gh api $url > "$name.zip"
+             unzip -d "$name" "$name.zip"
+           done
+
+      - name: Publish Test Results
+        uses: EnricoMi/publish-unit-test-result-action@2a60c5d47eb29cd5cc922f51bbea18e148f56203 # v2.0.0
+        with:
+          commit: ${{ github.event.workflow_run.head_sha }}
+          event_file: artifacts/Event File/event.json
+          event_name: ${{ github.event.workflow_run.event }}
+          nunit_files: "artifacts/**/*.xml"