Merge pull request #24 from Nsttt/add-readme

Add readme and compose file

README.md

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+# PostgreSQL Backup to S3 with Docker
+
+This application automates the process of backing up PostgreSQL databases and uploading them to an S3-compatible storage service, utilizing Docker for easy deployment and scheduling.
+
+## Features
+
+- Easy deployment with Docker and Docker Compose.
+- Support for multiple PostgreSQL databases.
+- Customizable backup intervals.
+- Direct upload of backups to an S3-compatible storage bucket.
+- Environment variable and command-line configuration for flexibility.
+- Secure handling of database and S3 credentials.
+
+## Prerequisites
+
+- Docker and Docker Compose installed on your system.
+- Access to a PostgreSQL database.
+- Access to an S3-compatible storage service.
+
+## Configuration
+
+Before running the application, you need to configure it either by setting environment variables in a `.env` file or by using command-line flags in the `docker-compose.yml`.
+
+### Environment Variables
+
+Create a `.env` file in the project directory with the following variables:
+
+- `URLS`: Comma-separated list of PostgreSQL database URLs to backup. Format: `postgres://<user>:<password>@<host>[:<port>]/<dbname>`
+- `S3_ENDPOINT`: The endpoint URL of your S3-compatible storage service.
+- `S3_BUCKET`: The name of the bucket where backups will be stored.
+- `S3_ACCESS_KEY`: Your S3 access key.
+- `S3_SECRET_KEY`: Your S3 secret key.
+- `INTERVAL`: How often to run the backup (e.g., `24h` for daily backups).
+
+### Docker Compose
+
+Alternatively, you can specify the configuration directly in the `docker-compose.yml` file under the `environment` section of your service:
+
+```yaml
+services:
+  app:
+    build: .
+    environment:
+      URLS: "postgres://user:password@host:port/dbname"
+      S3_ENDPOINT: "your_s3_endpoint"
+      S3_BUCKET: "your_s3_bucket"
+      S3_ACCESS_KEY: "your_s3_access_key"
+      S3_SECRET_KEY: "your_s3_secret_key"
+      INTERVAL: "24h"
+```
+
+## Running the Application with Docker
+
+There is an image available on `ghcr.io/thedevminertv/postgres_s3_backup` that you can use.
+
+Alternatively, you can build the image yourself:
+
+1. Build the Docker image:
+
+   ```sh
+   docker compose build
+   ```
+
+2. Start the application:
+
+   ```sh
+   docker compose up -d
+   ```
+
+This will start the application in the background. It will automatically perform backups based on the configured interval and upload them to the specified S3 bucket.
+
+## Monitoring and Logs
+
+To monitor the application's activity and view logs:
+
+```sh
+docker compose logs -f
+```
+
+This command will follow the log output of the container. Press `Ctrl+C` to exit log following.
+
+## Updating Configuration
+
+If you need to update the configuration, modify the `.env` file or the `docker-compose.yml` as necessary and restart the service:
+
+```sh
+docker compose down
+docker compose up -d
+```

compose.yml

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+version: "3.9"
+
+services:
+  pg_s3_backup:
+    build: .
+    environment:
+      URLS: "postgres://user:password@host:port/dbname"
+      S3_ENDPOINT: "your_s3_endpoint"
+      S3_BUCKET: "your_s3_bucket"
+      S3_ACCESS_KEY: "your_s3_access_key"
+      S3_SECRET_KEY: "your_s3_secret_key"
+      INTERVAL: "24h"