Add config to support building using dev containers

Tested with CLion and Podman on Fedora Kinoite 43.

.devcontainer/Dockerfile

@@ -0,0 +1,24 @@
+FROM mcr.microsoft.com/devcontainers/rust:2-1-trixie
+
+RUN rustup target add x86_64-pc-windows-gnu
+
+# Wine 10.19+ is needed to fix symlink behaviour.
+# Without this some tests fail.
+# <https://gitlab.winehq.org/wine/wine/-/wikis/Debian-Ubuntu>
+RUN mkdir -pm755 /etc/apt/keyrings \
+    && wget -O - https://dl.winehq.org/wine-builds/winehq.key | gpg --dearmor -o /etc/apt/keyrings/winehq-archive.key - \
+    && dpkg --add-architecture i386 \
+    && wget -NP /etc/apt/sources.list.d/ https://dl.winehq.org/wine-builds/debian/dists/trixie/winehq-trixie.sources
+
+RUN apt-get update && apt-get install -y --no-install-recommends \
+    cmake \
+    g++-mingw-w64-x86-64 \
+    winehq-stable \
+    && rm -rf /var/lib/apt/lists/*
+
+# Run the Windows tests through Wine.
+# Include the MinGW DLLs in Wine's search path so that running the C++ tests works.
+# Set the locale to a UTF-8 locale so that the Unicode filename tests pass.
+ENV CARGO_TARGET_X86_64_PC_WINDOWS_GNU_RUNNER=wine \
+    WINEPATH=/usr/lib/gcc/x86_64-w64-mingw32/14-win32/ \
+    LC_ALL=en_US.utf8

.devcontainer/devcontainer.json

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+{
+  "name": "libloot (Linux, MinGW cross-compile)",
+  "build": {
+    "dockerfile": "./Dockerfile"
+  },
+  "runArgs": [
+    "--userns=keep-id",
+  ],
+}