Adopt OCSentinel script layout and add Gitea workflow

.gitea/workflows/client-build.yml

@@ -0,0 +1,46 @@
+name: OfficeCom Sentinel Client
+
+on:
+  push:
+    branches:
+      - main
+    tags:
+      - "v*"
+  workflow_dispatch:
+
+jobs:
+  build-client:
+    runs-on:
+      - self-hosted
+      - windows
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Setup .NET
+        uses: actions/setup-dotnet@v4
+        with:
+          dotnet-version: "10.0.x"
+
+      - name: Build client package
+        shell: pwsh
+        run: |
+          ./build/build-client-package.ps1
+
+      - name: Build release manifest for tags
+        if: startsWith(github.ref, 'refs/tags/v')
+        shell: pwsh
+        run: |
+          $tag = "${{ github.ref_name }}"
+          $artifactUrl = "https://gitea.officecom.cloud/officecom/oc-sentinel/releases/download/$tag/OCSentinelClient-win-x64.zip"
+          ./build/build-release-manifest.ps1 -ArtifactUrl $artifactUrl
+
+      - name: Upload package artifacts
+        uses: actions/upload-artifact@v4
+        with:
+          name: ocsentinel-client-${{ github.sha }}
+          path: |
+            artifacts/OCSentinelClient-win-x64.zip
+            artifacts/OCSentinelClient-win-x64.zip.sha256
+            artifacts/version.json
+          if-no-files-found: warn