Add devcontainer

.devcontainer/Dockerfile

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+FROM alpine:3
+RUN apk add --no-cache texlive-xetex coreutils

.devcontainer/devcontainer.json

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+{
+    "service": "xelatex",
+    "dockerComposeFile": "docker-compose.devcontainer.yml",
+    "customizations": {
+        "vscode": {
+            "extensions": ["james-yu.latex-workshop"]
+        }
+    },
+    "workspaceFolder": "/workspace"
+}

.devcontainer/docker-compose.devcontainer.yml

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+version: "3"
+
+services:
+  xelatex:
+    build:
+      context: ./
+      dockerfile: ./Dockerfile
+    volumes:
+      - ../:/workspace
+    tty: true
+    entrypoint: sleep infinity