- add Dockerfile for local builds

Dockerfile

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+FROM fedora:37
+LABEL Description="Build environment"
+
+ENV HOME /root
+
+SHELL ["/bin/bash", "-c"]
+
+RUN dnf update -y && \
+    dnf groupinstall -y 'Development Tools' && \
+    dnf install -y make gcc gcc-c++ \
+    libjpeg-turbo-devel.i686 \
+    glibc-devel.i686 \
+    SDL2-devel.i686 \
+    openal-soft-devel.i686 \
+    flatpak flatpak-builder
+
+ENV APPVEYOR_BUILD_FOLDER=/src
+
+# Setting XDG_DATA_DIRS environement variable for flatpak
+ENV XDG_DATA_DIRS="/var/lib/flatpak/exports/share:${HOME}/.local/share/flatpak/exports/share:$XDG_DATA_DIRS"
+
+# Adding the flathub repo
+RUN flatpak --user remote-add --if-not-exists flathub https://flathub.org/repo/flathub.flatpakrepo
+
+# Adding Platform/SDK for the Linux flatpak release
+RUN flatpak --user install flathub org.freedesktop.Platform/x86_64/22.08 -y
+RUN flatpak --user install flathub org.freedesktop.Sdk/x86_64/22.08 -y
+RUN flatpak --user install flathub org.freedesktop.Sdk.Compat.i386/x86_64/22.08 -y
+RUN flatpak --user install flathub org.freedesktop.Sdk.Extension.toolchain-i386/x86_64/22.08 -y
+
+WORKDIR /src
+
+CMD ["/bin/bash"]
+
+# Building example:
+#   docker build -t builder/multiarch_build:1.0 -f Dockerfile .
+
+# Running example:
+#   docker run -it --privileged=true --rm --name=builder --mount type=bind,source=${PWD},target=/src builder/multiarch_build:1.0 bash

dockerbuild.sh

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+#!/usr/bin/env bash
+set -ex
+
+docker build -t builder/multiarch_build:1.0 -f Dockerfile .
+docker run -it --privileged=true --rm --name=builder --mount type=bind,source=${PWD},target=/src builder/multiarch_build:1.0 ./.appveyor/Build.sh