CI testing

.github/workflows/Dockerfile-retrofw

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+# build container for GP2X
+
+FROM --platform=linux/amd64 ubuntu:22.04
+
+ENV UNPRIVILEGED_USER_GROUPS=sudo
+
+# minimal build environment
+RUN	apt-get update && \
+	apt-get -y --no-install-recommends install sudo make vim git-core wget curl zip bzip2 xz-utils gcc g++ libc6-i386 && \
+	apt-get -y --no-install-recommends install
+
+# toolchain and libraries
+RUN	wget --no-check-certificate "https://git.libretro.com/libretro-infrastructure/libretro-build-dingux/-/raw/master/toolchain/retrofw-toolchain.2021-11-06.realoc.tar.gz" && \
+	tar xzCf /opt retrofw-toolchain.2021-11-06.realoc.tar.gz
+
+# toolchain definitions
+ENV PATH=/opt/retrofw-toolchain/bin:$PATH
+ENV CROSS_COMPILE=mipsel-RetroFW-linux-uclibc

.github/workflows/ci-retrofw.yml

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+name: CI (GCW0)
+on: [push, pull_request]
+jobs:
+  build-linux:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v3
+      with:
+        submodules: true
+    - name: build environment
+      run: |
+        whoami
+        docker build -f .github/workflows/Dockerfile-retrofw -t build-retrofw .
+    - name: build
+      run: |
+        ver=$(cut -d'"' -f2 platform/common/version.h)-$(git rev-parse --short HEAD)
+        dock="docker run -i -v $PWD:/home/picodrive -w /home/picodrive build-retrofw"
+        $dock sh -c "git config --global --add safe.directory /home/picodrive"
+        $dock sh -c "CROSS_COMPILE=mipsel-RetroFW-linux-uclibc- ./configure --platform=retrofw"
+        $dock sh -c "CROSS_COMPILE=mipsel-RetroFW-linux-uclibc- make"
+        mv PicoDrive.opk PicoDrive-retrofw-$ver.opk
+    - name: artifacts
+      uses: actions/upload-artifact@v3
+      with:
+        name: build result
+        path: PicoDrive-retrofw*.opk
+