Add local devcontainer environment

.devcontainer/Dockerfile

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+ARG VARIANT
+ARG MICROSOFT_BASE_IMAGE
+
+FROM ${MICROSOFT_BASE_IMAGE} AS base_image
+FROM retypeapp/retype:${VARIANT}
+
+ENV DEBIAN_FRONTEND=noninteractive \
+    LANG=en_US.UTF-8 \
+    LANGUAGE=en_US \
+    LC_ALL=C
+
+RUN apt-get update && \
+    apt-get install -y --no-install-recommends \
+        git \
+        less \
+        vim \
+        locales \
+        bash-completion \
+        openssh-client \
+    && \
+        apt-get clean \
+    && \
+        locale-gen --purge en_US.UTF-8 \
+    && \
+        groupadd -rg 1000 vscode && \
+        useradd -rms /bin/bash -u 1000 -g vscode vscode && \
+        chown -R vscode:vscode /usr/bin/retype
+
+USER vscode
+WORKDIR /home/vscode
+
+# Copy Microsoft's .bashrc from their devcontainer base image,
+# making the terminal look like an official one
+COPY --chown=vscode:vscode --from=base_image /home/vscode/.bashrc /home/vscode/.bashrc

.devcontainer/devcontainer.json

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+{
+    "name": "retype",
+    "build": {
+        "dockerfile": "Dockerfile",
+        "args": {
+            "VARIANT": "2.4.0-ubuntu-amd64",
+            "MICROSOFT_BASE_IMAGE": "mcr.microsoft.com/vscode/devcontainers/base:debian-11"
+        }
+    },
+
+    "mounts": [
+        "source=${localEnv:HOME}/.bash_history,target=/home/vscode/.bash_history,type=bind,consistency=cached",
+        "source=${localEnv:HOME}/.gitconfig,target=/home/vscode/.gitconfig,type=bind,consistency=cached",
+        "source=${localEnv:HOME}/.ssh,target=/home/vscode/.ssh,type=bind,consistency=cached",
+        "source=/etc/resolv.conf,target=/etc/resolv.conf,type=bind,consistency=cached"
+    ],
+
+    "containerEnv": {
+        "EDITOR": "vim",
+        "GIT_EDITOR": "vim"
+    },
+
+    "forwardPorts": [5000],
+    "remoteUser": "vscode"
+}