Add readme

README.md

@@ -0,0 +1,39 @@
+# S3 backed Maria & Postgres Databases
+
+This project comes out of frustration with ephemeral services not providing a trivial database for non-critical services 
+that can be persisted beyond a restart.
+
+This system starts and checks an s3 bucket for database dumps, downloads loads the most recent one and resets the database to that state.
+
+Every 600 seconds after that, it dumps the database and persists it to s3 if there have been any changes.
+
+This is extremely not meant for production workloads or anything you want to keep. QA systems, silly side projects, anything you don't want to pay Bezos for RDS for. 
+On that note, please consider using Minio or any other S3 provider than AWS.
+
+## Configuration:
+
+### MariaDB
+```yaml
+      MARIADB_RANDOM_ROOT_PASSWORD: "yes"
+      MARIADB_USER: example
+      MARIADB_PASSWORD: changeme
+      MARIADB_DATABASE: s3db
+      S3_ENDPOINT: http://minio:9000/
+      S3_API_KEY: <<secret>>
+      S3_API_SECRET: <<secret>>
+      S3_USE_PATH_STYLE_ENDPOINT: "yes" # This is only strictly neccisary with Minio, maybe others. 
+      S3_BUCKET: "s3db"
+      S3_PREFIX: "test/mariadb/"
+```
+
+### Postgres
+```yaml
+      POSTGRES_USER: example
+      POSTGRES_PASSWORD: changeme
+      S3_ENDPOINT: http://minio:9000/
+      S3_API_KEY: <<secret>>
+      S3_API_SECRET: <<secret>>
+      S3_USE_PATH_STYLE_ENDPOINT: "yes" # This is only strictly neccisary with Minio, maybe others. 
+      S3_BUCKET: "s3db"
+      S3_PREFIX: "test/postgres/"
+```

docker-compose.yml

@@ -53,7 +53,7 @@ services:
       dockerfile: Dockerfile.mariadb
       args:
         MARIADB_VERSION: 10.9
-    environment:
+    environment: &mariadb
       MARIADB_RANDOM_ROOT_PASSWORD: "yes"
       MARIADB_USER: example
       MARIADB_PASSWORD: changeme
@@ -80,16 +80,7 @@ services:
       args:
         MARIADB_VERSION: 10.3
     environment:
-      MARIADB_RANDOM_ROOT_PASSWORD: "yes"
-      MARIADB_USER: example
-      MARIADB_PASSWORD: changeme
-      MARIADB_DATABASE: s3db
-      S3_ENDPOINT: http://minio:9000/
-      S3_API_KEY: *s3_key
-      S3_API_SECRET: *s3_secret
-      S3_USE_PATH_STYLE_ENDPOINT: "yes"
-      S3_BUCKET: "s3db"
-      S3_PREFIX: "test/mariadb/"
+      <<: *mariadb
     ports:
       - "127.0.0.127:3306:3306"
     depends_on: