Squashed 'libs/cli11/' content from commit dcbcb47

git-subtree-dir: libs/cli11
git-subtree-split: dcbcb4721dda5dab0a56d9faaaee50e6a30f7758

.github/workflows/build.yml

@@ -0,0 +1,59 @@
+name: Build
+on:
+  push:
+    branches:
+      - main
+      - v*
+    tags:
+      - "*"
+  pull_request:
+
+jobs:
+  single-header:
+    name: Single header
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+        with:
+          submodules: true
+
+      - uses: actions/setup-python@v4
+        with:
+          python-version: "3.x"
+
+      - name: Prepare CMake config
+        run: cmake -S . -B build -DCLI11_SINGLE_FILE=ON
+
+      - name: Make package
+        run: cmake --build build --target package_source
+
+      - name: Copy source packages
+        run: |
+          mkdir -p CLI11-Source
+          cp build/CLI11-*-Source.* CLI11-Source
+          cp build/CLI11-*-Source.* .
+
+      - name: Make header
+        run: cmake --build build --target CLI11-generate-single-file
+
+      - name: Copy file to main folder
+        run: cp build/include/CLI11.hpp CLI11.hpp
+
+      - uses: actions/upload-artifact@v3
+        with:
+          name: CLI11.hpp
+          path: CLI11.hpp
+
+      - uses: actions/upload-artifact@v3
+        with:
+          name: CLI11-Source
+          path: CLI11-Source
+
+      - name: Release
+        uses: softprops/action-gh-release@v1
+        if: startsWith(github.ref, 'refs/tags/')
+        with:
+          files: |
+            CLI11.hpp
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}