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README.md

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+# Terraform Development with VSCode Dev Container
+
+<div align="center">
+
+[![Terraform](https://img.shields.io/badge/Terraform-7B42BC?style=flat&logo=terraform&logoColor=white)](https://github.com/hashicorp/terraform)
+
+[![Docker](https://github.com/a5chin/terraform-template/actions/workflows/docker.yml/badge.svg)](https://github.com/a5chin/terraform-template/actions/workflows/docker.yml)
+[![Terraform](https://github.com/a5chin/terraform-template/actions/workflows/terraform.yml/badge.svg)](https://github.com/a5chin/terraform-template/actions/workflows/terraform.yml)
+
+</div>
+
+## Overview
+This repository contains configurations to set up a Terraform development environment using VSCode's Dev Container feature.
+
+![demo](assets/gif/tfmt.gif)
+
+If the Terraform format does not work, try reloading the VS Code window.
+Specifically, you can solve this problem by following the steps below.
+
+1. Type `⌘+⇧+P` to open the command palette
+2. Type `Developer: Reload Window` in the command palette to reload the window
+
+### Contents
+- [Terraform Development with VSCode Dev Container](#terraform-development-with-vscode-dev-container)
+  - [Overview](#overview)
+    - [Contents](#contents)
+  - [Settings](#settings)
+  - [Dev Container](#dev-container)
+  - [GitHub Actions](#github-actions)
+  - [pre-commit](#pre-commit)
+  - [Appendix](#appendix)
+    - [The structure of this repository](#the-structure-of-this-repository)
+
+## Settings
+- files.insertFinalNewline
+- files.trimTrailingWhitespace
+- editor.formatOnSave
+  - dockercompose
+  - dockerfile
+  - github-actions-workflow
+  - json, jsonc
+  - terraform
+  - yaml
+
+## Dev Container
+- `devcontainer.json`
+  - features
+    - hadolint
+    - pre-commit
+    - terraform-docs
+  - extentions
+    - [aquasecurityofficial.trivy-vulnerability-scanner](https://marketplace.visualstudio.com/items?itemName=aquasecurityofficial.trivy-vulnerability-scanner)
+    - [codezombiech.gitignore](https://marketplace.visualstudio.com/items?itemName=codezombiech.gitignore)
+    - [eamodio.gitlens](https://marketplace.visualstudio.com/items?itemName=eamodio.gitlens)
+    - [exiasr.hadolint](https://marketplace.visualstudio.com/items?itemName=exiasr.hadolint)
+    - [hashicorp.terraform](https://marketplace.visualstudio.com/items?itemName=hashicorp.terraform)
+    - [mosapride.zenkaku](https://marketplace.visualstudio.com/items?itemName=mosapride.zenkaku)
+    - [ms-azuretools.vscode-docker](https://marketplace.visualstudio.com/items?itemName=ms-azuretools.vscode-docker)
+    - [ms-vscode-remote.remote-containers](https://marketplace.visualstudio.com/items?itemName=ms-vscode-remote.remote-containers)
+    - [oderwat.indent-rainbow](https://marketplace.visualstudio.com/items?itemName=oderwat.indent-rainbow)
+    - [pkief.material-icon-theme](https://marketplace.visualstudio.com/items?itemName=pkief.material-icon-theme)
+    - [redhat.vscode-yaml](https://marketplace.visualstudio.com/items?itemName=redhat.vscode-yaml)
+    - [shardulm94.trailing-spaces](https://marketplace.visualstudio.com/items?itemName=shardulm94.trailing-spaces)
+    - [usernamehw.errorlens](https://marketplace.visualstudio.com/items?itemName=usernamehw.errorlens)
+    - [yzhang.markdown-all-in-one](https://marketplace.visualstudio.com/items?itemName=yzhang.markdown-all-in-one)
+- `Dockerfile`
+    - tfenv
+    - trivy
+    - google cloud
+
+## GitHub Actions
+- `docker.yml`
+  - Workflow to check if you can build with Docker
+- `terraform.yml`
+  - Workflow to check
+    - format
+    - lint
+    - test
+    - validation
+
+## pre-commit
+The `.pre-commit-config.yaml` file can contain scripts to be executed before commit.
+
+```sh
+# Terraform Formatter
+terraform fmt .
+
+# Terraform Linter
+tflint --recursive
+
+# Terraform Docs
+terraform-docs markdown table --output-file README.md --output-mode inject /path/to/module
+```
+
+## Appendix
+
+### The structure of this repository
+```
+.
+├── .devcontainer
+│   ├── devcontainer.json
+│   └── Dockerfile
+├── .github
+│   └── workflows
+│       └── terraform.yml
+├── .vscode
+│   ├── extensions.json
+│   └── settings.json
+├── environments
+│   ├── dev
+│   │   ├── .terraform-version
+│   │   ├── backend.tf
+│   │   ├── main.tf
+│   │   ├── outputs.tf
+│   │   ├── provider.tf
+│   │   └── versions.tf
+│   ├── prod
+│   │   ├── .terraform-version
+│   │   ├── backend.tf
+│   │   ├── main.tf
+│   │   ├── outputs.tf
+│   │   ├── provider.tf
+│   │   └── versions.tf
+│   └── stg
+│       ├── .terraform-version
+│       ├── backend.tf
+│       ├── main.tf
+│       ├── outputs.tf
+│       ├── provider.tf
+│       └── versions.tf
+└── modules
+│   ├── gcs2spanner
+│   │   ├── README.md
+│   │   ├── architecture.drawio.svg
+│   │   ├── dataflow.tf
+│   │   ├── functoins.tf
+│   │   ├── gcs.tf
+│   │   ├── main.tf
+│   │   ├── main.tftest.hcl
+│   │   ├── outputs.tf
+│   │   ├── provider.tf
+│   │   ├── sa.tf
+│   │   ├── src
+│   │   │   ├── authz.py
+│   │   │   ├── extract.py
+│   │   │   ├── logger.py
+│   │   │   ├── main.py
+│   │   │   ├── requirements.txt
+│   │   │   └── tests
+│   │   │       └── test_extract.py
+│   │   ├── variables.tf
+│   │   └── vpc.tf
+│   ├── log2bq
+│   │   ├── README.md
+│   │   ├── bigquery.tf
+│   │   ├── logging.tf
+│   │   ├── main.tf
+│   │   ├── outputs.tf
+│   │   ├── provider.tf
+│   │   └── variables.tf
+│   ├── microservices
+│   │   ├── README.md
+│   │   ├── architecture.drawio.svg
+│   │   ├── backend.tf
+│   │   ├── db.tf
+│   │   ├── frontend.tf
+│   │   ├── main.tf
+│   │   ├── outputs.tf
+│   │   ├── provider.tf
+│   │   ├── variables.tf
+│   │   └── vpc.tf
+│   └── monitoring-tools
+│       ├── README.md
+│       ├── alert.tf
+│       ├── channel.tf
+│       ├── main.tf
+│       ├── main.tftest.hcl
+│       ├── outputs.tf
+│       ├── provider.tf
+│       └── variables.tf
+├── .dockerignore
+├── .gitignore
+├── .pre-commit-config.yaml
+├── .tflint.hcl
+└── README.md
+```