be/ReadMe (#28)

* fix: remove jpa stuff from configuration

* doc: Add backend README.md

backend/README.md

@@ -0,0 +1,39 @@
+# Backend
+
+## Environment Variables
+
+### Database
+
+**``SPRING_DATASOURCE_URL``**: JDBC url to a postgres database. E.g.: `jdbc:postgresql://HOST:PORT/DATABASE`
+
+**``SPRING_DATASOURCE_USERNAME``**: Account username for the postgres database.
+
+**``SPRING_DATASOURCE_PASSWORD``**: Account password for the postgres database.
+
+### Other
+
+**``JWT_KEY``**: Key to sign all jwts. **A change in production would invalidate all json web tokens!**
+
+## Local Development
+
+We recommend using JetBrains IDE `IntelliJ IDEA`. The backend is a `Spring Boot Application`.
+For local development we've set up a docker-compose file and a local application config.
+
+Run the local docker-compose file:
+```bash
+docker-compose -f docker-compose-local.yml up -d
+```
+
+And **then** start the application with the `local` profile.
+```bash
+./mvnw spring-boot:run -Dspring-boot.run.profiles=local
+```
+
+**NOTE**: You can run the application in IntelliJ with a `Spring Boot` Run Configuration. There you have to set `Active Profiles` to `local`.
+
+## Deployment
+
+The application includes a `Dockerfile` and can be run everywhere. This project initially aimed to teach us the basics of
+cloud work, so it will be automatically deployed to [Render](https://render.com).
+
+**Please make sure to set all required environment variables before running the application.**

backend/src/main/resources/application-local.yml

@@ -3,8 +3,5 @@ spring:
     url: jdbc:postgresql://127.0.0.1:5432/local
     username: user
     password: pw
-  jpa:
-    hibernate:
-      ddl-auto: create-drop
 jwt:
   key: "Lo16Oo15M150c13mTlgdJUxj7ZlaBdteZsbkUClLN2I"

backend/src/main/resources/application.yml

@@ -1,7 +1,3 @@
 spring:
   datasource:
-    driver-class-name: org.postgresql.Driver
-  jpa:
-    hibernate:
-      ddl-auto: update
-    database-platform: org.hibernate.dialect.PostgreSQLDialect
+    driver-class-name: org.postgresql.Driver