Add cross-platform builder in github action

.github/workflows/dockcross.yml

@@ -0,0 +1,72 @@
+name: Dockcross
+
+on:
+  push:
+    branches:
+      - "*"
+    paths-ignore:
+      - "**/README.md"
+  pull_request:
+    branches:
+      - "*"
+
+jobs:
+  image:
+    name: "Build ${{ matrix.image_name }} ${{ matrix.build_type }}"
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        # Remove images that you do not need
+        image_name:
+          [
+            android-arm,
+            android-arm64,
+            android-x86,
+            android-x86_64,
+            linux-x86,
+            linux-x64,
+            linux-x64-clang,
+            linux-arm64,
+            linux-arm64-musl,
+            linux-arm64-full,
+            linux-armv5,
+            linux-armv5-musl,
+            linux-m68k-uclibc,
+            linux-s390x,
+            linux-x64-tinycc,
+            linux-armv6,
+            linux-armv6-lts,
+            linux-armv6-musl,
+            linux-armv7l-musl,
+            linux-armv7,
+            linux-armv7a,
+            linux-x86_64-full,
+            linux-mips,
+            linux-ppc64le,
+            linux-riscv64,
+            linux-riscv32,
+            linux-xtensa-uclibc,
+            windows-static-x86,
+            windows-static-x64,
+            windows-static-x64-posix,
+            windows-armv7,
+            windows-shared-x86,
+            windows-shared-x64,
+            windows-shared-x64-posix,
+            windows-arm64,
+            manylinux2014-x64,
+            manylinux2014-x86,
+            manylinux2014-aarch64,
+            web-wasm,
+          ]
+        # Disable MinSizeRel RelWithDebInfo Debug Release
+        build_type: [Debug]
+    steps:
+      - name: "Checkout Code"
+        uses: actions/checkout@v2
+        with:
+          submodules: "recursive"
+          fetch-depth: 0
+      - name: "build"
+        run: ./tools/dockcross-cmake-builder.sh ${{ matrix.image_name }} -DCMAKE_BUILD_TYPE=${{ matrix.build_type }}

tools/dockcross-cmake-builder.sh

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+#!/usr/bin/env bash
+
+if (( $# >= 1 )); then
+    image=$1
+    build_file=build-${image%:*}
+    shift 1
+
+    cmake_arg=$@
+    echo "cmake arg: $cmake_arg"
+
+    #echo "Pulling dockcross/$image"
+    #docker pull dockcross/"$image"
+
+    echo "Make script dockcross-$image"
+    docker run --rm dockcross/"$image" > ./dockcross-"$image"
+    chmod +x ./dockcross-"$image"
+
+    echo "Build $build_file"
+    ./dockcross-"$image" cmake -B "$build_file" -S . -G Ninja $cmake_arg
+    ./dockcross-"$image" ninja -C "$build_file"
+else
+    echo "Usage: ${0##*/} <docker imag (ex: linux-x64/linux-x64-clang/linux-arm64/windows-shared-x64/windows-static-x64...)> <cmake arg.>"
+    exit 1
+fi