Add GitHub Actions workflow for release automation

.github/workflows/release.yml

@@ -0,0 +1,48 @@
+name: Release
+on:
+  push:
+    tags:
+      - '[0-9]+.[0-9]+.[0-9]+'
+      - '[0-9]+.[0-9]+.[0-9]+-*'
+  workflow_dispatch:
+env:
+  DOTNET_NOLOGO: true
+defaults:
+  run:
+    shell: pwsh
+jobs:
+  release:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v6.0.2
+        with:
+          fetch-depth: 0
+      - name: Setup .NET SDK
+        uses: actions/setup-dotnet@v5.2.0
+        with:
+          global-json-file: global.json
+      - name: Build
+        run: dotnet build src --configuration Release
+      - name: Sign NuGet packages
+        uses: Particular/sign-nuget-packages-action@v1.0.0
+        with:
+          client-id: ${{ secrets.AZURE_KEY_VAULT_CLIENT_ID }}
+          tenant-id: ${{ secrets.AZURE_KEY_VAULT_TENANT_ID }}
+          client-secret: ${{ secrets.AZURE_KEY_VAULT_CLIENT_SECRET }}
+          certificate-name: ${{ secrets.AZURE_KEY_VAULT_CERTIFICATE_NAME }}
+      - name: Publish artifacts
+        uses: actions/upload-artifact@v7.0.1
+        with:
+          name: nugets
+          path: nugets/*
+          retention-days: 1
+      - name: Push packages to testing feed
+        if: ${{ github.event_name == 'workflow_dispatch' }}
+        run: dotnet nuget push nugets\*.nupkg --api-key ${{ secrets.FEEDZIO_PUBLISH_API_KEY }} --source "${{ vars.PARTICULAR_TESTING_FEED_URL }}"
+      - name: Deploy
+        if: ${{ github.event_name == 'push' && github.ref_type == 'tag' }}
+        # Does not follow standard practice of targeting explicit versions because configuration is tightly coupled to Octopus Deploy configuration
+        uses: Particular/push-octopus-package-action@main
+        with:
+          octopus-deploy-api-key: ${{ secrets.OCTOPUS_DEPLOY_API_KEY }}