Add Gitea workflow for cross-platform standalone builds

.gitea/workflows/build-standalone-release.yml

@@ -0,0 +1,65 @@
+name: Build Standalone Releases
+
+on:
+  workflow_dispatch:
+  push:
+    tags:
+      - "v*"
+
+jobs:
+  build:
+    strategy:
+      fail-fast: false
+      matrix:
+        include:
+          - os: linux
+            runs-on: ubuntu-latest
+            shell: bash
+            build_cmd: |
+              chmod +x build/build_linux.sh build/package_linux.sh
+              ./build/build_linux.sh
+              ./build/package_linux.sh
+            artifact_glob: release/PDFtoICS-linux-v*.tar.gz
+
+          - os: macos
+            runs-on: macos-latest
+            shell: bash
+            build_cmd: |
+              chmod +x build/build_macos.sh build/package_macos.sh
+              ./build/build_macos.sh
+              ./build/package_macos.sh
+            artifact_glob: release/PDFtoICS-macos-v*.zip
+
+          - os: windows
+            runs-on: windows-latest
+            shell: pwsh
+            build_cmd: |
+              cmd /c build\build_windows.cmd
+              cmd /c build\package_windows.cmd
+            artifact_glob: release/PDFtoICS-windows-v*.zip
+
+    runs-on: ${{ matrix.runs-on }}
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Setup Python
+        uses: actions/setup-python@v5
+        with:
+          python-version: "3.12"
+
+      - name: Create venv
+        shell: ${{ matrix.shell }}
+        run: |
+          python -m venv .venv
+
+      - name: Build + Package
+        shell: ${{ matrix.shell }}
+        run: ${{ matrix.build_cmd }}
+
+      - name: Upload artifact
+        uses: actions/upload-artifact@v4
+        with:
+          name: ${{ matrix.os }}-release
+          path: ${{ matrix.artifact_glob }}

BUILD_STANDALONE.md

@@ -54,6 +54,11 @@ git push origin main
 git push origin vx.y.z
 ```
 
+Optional per CI:
+- Workflow: `.gitea/workflows/build-standalone-release.yml`
+- Trigger: Tag-Push `v*`
+- Ergebnis: Plattform-Artefakte als CI-Artefakte
+
 ---
 
 ## Linux