Add container definitions

.devcontainer/Dockerfile

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+# See here for image contents: https://github.com/microsoft/vscode-dev-containers/tree/v0.205.2/containers/debian/.devcontainer/base.Dockerfile
+
+# [Choice] Debian version (use bullseye or stretch on local arm64/Apple Silicon): bullseye, buster, stretch
+ARG VARIANT="latest"
+FROM ghcr.io/openscript/vscode-dev-container-tectonic:${VARIANT}
+
+# ** [Optional] Uncomment this section to install additional packages. **
+# RUN apt-get update && export DEBIAN_FRONTEND=noninteractive \
+#     && apt-get -y install --no-install-recommends <your-package-list-here>
+

.devcontainer/devcontainer.json

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+// For format details, see https://aka.ms/devcontainer.json. For config options, see the README at:
+// https://github.com/microsoft/vscode-dev-containers/tree/v0.205.2/containers/debian
+{
+  "name": "Tectonic",
+  "build": {
+    "dockerfile": "Dockerfile",
+    // Update 'VARIANT' to pick an Debian version: bullseye, buster, stretch
+    // Use bullseye or stretch on local arm64/Apple Silicon.
+    "args": { "VARIANT": "latest" }
+  },
+
+  // Set *default* container specific settings.json values on container create.
+  "settings": {},
+
+  // Add the IDs of extensions you want installed when the container is created.
+  "extensions": [],
+
+  // Use 'forwardPorts' to make a list of ports inside the container available locally.
+  // "forwardPorts": [],
+
+  // Uncomment to use the Docker CLI from inside the container. See https://aka.ms/vscode-remote/samples/docker-from-docker.
+  // "mounts": [ "source=/var/run/docker.sock,target=/var/run/docker.sock,type=bind" ],
+
+  // Uncomment when using a ptrace-based debugger like C++, Go, and Rust
+  // "runArgs": [ "--cap-add=SYS_PTRACE", "--security-opt", "seccomp=unconfined" ],
+
+  // Comment out connect as root instead. More info: https://aka.ms/vscode-remote/containers/non-root.
+  // "remoteUser": "vscode"
+}