bare minimum devcontainer test

.devcontainer/Dockerfile

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+# FROM mcr.microsoft.com/devcontainers/dotnet:0-6.0
+FROM mcr.microsoft.com/devcontainers/base:debian-11
+
+# Add backports.
+RUN echo "deb http://deb.debian.org/debian bullseye-backports main" > /etc/apt/sources.list.d/backports.list
+
+# Install dependencies.
+RUN apt-get update && apt-get install -y --no-install-recommends \
+  file \
+  nsis \
+  imagemagick \
+  wine64 \
+  shellcheck
+
+# Install dotnet SDK and PowerShell.
+RUN curl -SOL https://packages.microsoft.com/config/debian/11/packages-microsoft-prod.deb \
+  && dpkg -i packages-microsoft-prod.deb \
+  && rm packages-microsoft-prod.deb \
+  && apt-get update \
+  && apt-get install -y --no-install-recommends \
+  dotnet-sdk-6.0 \
+  powershell
+
+# Install updated packages from backports.
+RUN apt-get update && sudo apt-get install -y --no-install-recommends \
+  curl/bullseye-backports \
+  wine64/bullseye-backports
+
+# Install AppImageTool.
+RUN curl -SLO https://github.com/AppImage/AppImageKit/releases/download/continuous/appimagetool-x86_64.AppImage \
+  && install appimagetool-x86_64.AppImage /usr/local/bin \
+  && rm appimagetool-x86_64.AppImage
+
+
+# Download rcdedit.
+USER vscode
+RUN curl -SLo /home/vscode/rcedit-x64.exe https://github.com/electron/rcedit/releases/download/v1.1.1/rcedit-x64.exe
+ENV PATH=/usr/lib/wine/:$PATH

.devcontainer/devcontainer.json

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+{
+	"name": "C# (.NET)",
+	"build": {
+		"dockerfile": "Dockerfile"
+	},
+	"customizations": {
+		"vscode": {
+			"extensions": [
+				"EditorConfig.EditorConfig",
+				"foxundermoon.shell-format",
+				"GitHub.vscode-github-actions",
+				"idleberg.nsis",
+				"macabeus.vscode-fluent",
+				"ms-dotnettools.csdevkit",
+				"ms-dotnettools.csharp",
+				"ms-python.python",
+				"ms-vscode.cpptools-extension-pack",
+				"ms-vscode.makefile-tools",
+				"ms-vscode.powershell",
+				"nico-castell.linux-desktop-file",
+				"openra.oraide-vscode",
+				"openra.vscode-openra-lua",
+				"tamasfe.even-better-toml",
+				"timonwong.shellcheck"
+			]
+		}
+	},
+	"features": {},
+	"postAttachCommand": {
+		"safe-dir": "git config --global --add safe.directory ${containerWorkspaceFolder}"
+	}
+}