chore: readme rewritten

Author: calmonr

README.md

@@ -1,3 +1,197 @@
 # Go CI/CD Playground
 
-> This documentation is being completely rewritten explaining better the purpose of this repository and how to use it.
+This repository is a playground for experimenting with CI/CD in Go. It is a well-structured command-line application that serves a gRPC service and is an excellent example of how to structure a Go project.
+
+It is not intended to be a complete application but a starting point for your projects.
+
+## Table of Contents
+
+- [CI/CD](#cicd)
+  - [Actions](#actions)
+    - [Release](#release)
+- [Application](#application)
+  - [Running the application](#running-the-application)
+    - [Running locally](#running-locally)
+    - [Running in a Docker container](#running-in-a-docker-container)
+  - [Development](#development)
+    - [Protobuf](#protobuf)
+- [Tools](#tools)
+- [Tips](#tips)
+- [Code of Conduct](#code-of-conduct)
+
+## CI/CD
+
+It is all based on pushes and pull requests. Here is the list of actions triggered based on each event:
+
+- When a tag is pushed: `lint`, `release`, and `security` actions are triggered.
+- When a commit is pushed to the `main` branch or a pull request is opened: `build`, `lint`, `security`, and `test` actions are triggered.
+
+> **Note**
+>
+> You need to configure the following secrets in the repository settings:
+>
+> - `DOCKERHUB_USERNAME`: The username of the Docker Hub account.
+> - `DOCKERHUB_TOKEN`: The token of the Docker Hub account.
+> - `GITLEAKS_NOTIFY_USER_LIST`: The list of users to notify when a secret leak is found.
+
+### Actions
+
+- The [build action](.github/workflows/build.yml) builds the binaries for checking the code.
+- The [lint action](.github/workflows/lint.yml) runs `golangci-lint` on the code and `buf` on the protobuf files ([example](https://github.com/calmonr/cicd/pull/3)).
+- The [release action](.github/workflows/release.yml) runs `goreleaser` to build and publish the binaries ([examples](https://github.com/calmonr/cicd/releases)).
+- The [security action](.github/workflows/security.yml) runs `gitleaks` to check for secret leaks ([example](https://github.com/calmonr/cicd/pull/2)).
+- The [test action](.github/workflows/test.yml) runs the unit tests.
+
+> **Note**
+>
+> You can use [act](https://github.com/nektos/act) to run GitHub Actions locally.
+
+#### Release
+
+`goreleaser` is the core of the release process. It is configured in the [`.goreleaser.yaml`](.goreleaser.yaml) file.
+
+For multiple architectures, all Docker images are pushed to the GitHub Container Registry and Docker Hub.
+
+The binary is built using the `ldflags` flag to embed the version, commit and build time in the binary. The `version` command or the `--version` can print this information.
+
+There are also a few completion scripts for the `bash`, `zsh`, and `fish` shells in the released archives.
+
+> **Note**
+>
+> The releases are created as drafts. You need to manually publish them, allowing you to review the release notes before publishing.
+
+## Application
+
+The application is a **simple** gRPC server with a greeting service. It has a single endpoint, `Hi`, which takes a `HiRequest` and returns a `HiResponse`. The `HiRequest` contains a `name` field, which is used to construct the `HiResponse` message.
+
+### Running the application
+
+You can either run the application locally or in a Docker container.
+
+#### Running locally
+
+It can be configured using environment variables or a configuration file. The configuration file will only be used if the `--config-file` flag is provided.
+
+> **Note**
+>
+> There is a sample configuration file in the `configs` directory.
+
+Using environment variables:
+
+```bash
+export PLAYGROUND_LOG_LEVEL=info
+export PLAYGROUND_GRPC_SERVER_ADDRESS=:50051
+export PLAYGROUND_GRPC_SERVER_NETWORK=tcp
+
+go run ./cmd/playground/main.go
+```
+
+Using a configuration file:
+
+```bash
+go run ./cmd/playground/main.go --config-file ./configs/development.yaml
+```
+
+#### Running in a Docker container
+
+The [Dockerfile](./Dockerfile) is located at the repository's root. It is a multi-stage build that builds the binary and then copies it to a scratch image.
+
+First, we need to build the image:
+
+```bash
+docker build -t playground .
+```
+
+Then we can run the container:
+
+```bash
+docker run \
+  -e PLAYGROUND_LOG_LEVEL=info \
+  -e PLAYGROUND_GRPC_SERVER_ADDRESS=:50051 \
+  -e PLAYGROUND_GRPC_SERVER_NETWORK=tcp \
+  -p 50051:50051 \
+  playground
+```
+
+> **Note**
+>
+> There is a `docker-compose.yml` that you can use as well.
+>
+> ```bash
+> docker-compose up -d
+> ```
+>
+> You can switch from `docker` to `nerdctl` if you use Containerd.
+
+### Development
+
+You will need to install a few tools before you can start developing the application.
+
+```bash
+sh ./scripts/install-tools.sh
+```
+
+#### Protobuf
+
+[Buf](https://docs.buf.build/introduction) is used to lint the protobuf definitions and generate source code from them.
+
+You can find the protobuf definitions in the `proto` directory.
+
+Before we continue, let us verify that everything is set up correctly:
+
+```console
+buf build
+```
+
+You can run all of the configured lint rules by running this command:
+
+```console
+buf lint
+```
+
+Now we can generate the source code for our service:
+
+```console
+buf generate -o pkg/proto proto/internal
+```
+
+## Tools
+
+Here is a list of tools used in this repository:
+
+> **Warning**
+>
+> I might have missed some, so feel free to open a pull request if you think something is missing. :nerd_face:
+
+- [x] [GoReleaser](https://goreleaser.com/)
+- [x] [golangci-lint](https://golangci-lint.run/)
+- [x] [EditorConfig](https://editorconfig.org/)
+- [x] [Gitleaks](https://gitleaks.io/)
+- [x] [Cobra](https://cobra.dev/)
+- [x] [Viper](https://github.com/spf13/viper)
+- [x] [zap](https://github.com/uber-go/zap)
+- [x] [gRPC](https://grpc.io/)
+  - [x] [Buf](https://buf.build/)
+
+## Tips
+
+It would be best if you used [pre-commit](https://pre-commit.com/) to run linting and testing on your project; this way, you can catch problems before they are committed.
+
+```yaml
+---
+repos:
+  - repo: https://github.com/golangci/golangci-lint
+    rev: v1.49.0
+    hooks:
+      - id: golangci-lint
+  - repo: https://github.com/zricethezav/gitleaks
+    rev: v8.13.0
+    hooks:
+      - id: gitleaks
+default_install_hook_types: [pre-commit]
+minimum_pre_commit_version: 2.20.0
+```
+
+## Code of Conduct
+
+This project adheres to the Contributor Covenant [code of conduct](CODE_OF_CONDUCT.md). By participating, you are expected to uphold this code.

config/.gitignore renamed to configs/.gitignore

@@ -0,0 +1,11 @@
+---
+version: "3"
+services:
+  playground:
+    image: calmonr/cicd:latest
+    ports:
+      - 50051:50051
+    environment:
+      PLAYGROUND_LOG_LEVEL: info
+      PLAYGROUND_GRPC_SERVER_ADDRESS: 50051
+      PLAYGROUND_GRPC_SERVER_NETWORK: tcp