chore: add devcontainer definitions

.devcontainer/Dockerfile

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+ARG VARIANT="20-bullseye"
+FROM mcr.microsoft.com/vscode/devcontainers/typescript-node:0-${VARIANT}
+
+RUN apt-get update && apt-get install bash-completion gnupg2 -y

.devcontainer/devcontainer.json

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+{
+  "name": "GitHub Runners AWS",
+  "build": { "dockerfile": "Dockerfile" },
+  "features": {
+    "ghcr.io/devcontainers/features/github-cli:1": {},
+    "ghcr.io/devcontainers-contrib/features/prettier:1": {}
+  },
+  "remoteEnv": {
+    "GITHUB_TOKEN": "${localEnv:GITHUB_TOKEN}"
+  },
+  "customizations": {
+    "vscode": {
+      "extensions": [
+        "editorconfig.editorconfig",
+        "esbenp.prettier-vscode",
+        "github.vscode-pull-request-github",
+        "orta.vscode-jest",
+        "yzhang.markdown-all-in-one"    
+      ]
+    }
+  },
+  "postCreateCommand": "yarn install",
+  "waitFor": "postCreateCommand",
+  "onCreateCommand": "sudo cp .devcontainer/welcome.txt /usr/local/etc/vscode-dev-containers/first-run-notice.txt",
+}

.devcontainer/updateContent.sh

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+yarn install --frozen-lockfile
+printf "source \$WORKSPACE/.devcontainer/bashrc.sh\n" >> ~/.bashrc

.devcontainer/welcome.txt

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+  ,-----.    _,-._
+ /       \  / \_/ \
+| action | >-(_)-<  Generate docs
+ \       /  \_/ \_/  for your actions.
+  `-----'     `-'
+
+Welcome to action-docs

.vscode/extensions.json

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+{
+  // See http://go.microsoft.com/fwlink/?LinkId=827846
+  // for the documentation about the extensions.json format
+  "recommendations": [
+    // Extension identifier format: ${publisher}.${name}. Example: vscode.csharp
+    "editorconfig.editorconfig",
+    "esbenp.prettier-vscode",
+    "github.vscode-pull-request-github",
+    "ms-vscode-remote.remote-containers",
+    "orta.vscode-jest",
+    "yzhang.markdown-all-in-one"
+  ]
+}

.vscode/settings.json

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+{
+  "[typescript]": {
+    "editor.defaultFormatter": "esbenp.prettier-vscode",
+    "editor.formatOnSave": true
+  },
+  "[md]": {
+    "editor.defaultFormatter": "esbenp.prettier-vscode",
+    "editor.formatOnSave": true
+  },
+  "[json]": {
+    "editor.defaultFormatter": "esbenp.prettier-vscode",
+    "editor.formatOnSave": true
+  }
+}