Move Docker configuration secrets to environment file

.env.example

@@ -0,0 +1,7 @@
+POSTGRES_DB=concerts
+POSTGRES_USER=concerts
+POSTGRES_PASSWORD=CHANGE_ME
+
+INITIAL_ADMIN_USERNAME=Kai
+INITIAL_ADMIN_PASSWORD=03vogjhq-Metal
+INITIAL_ADMIN_EMAIL=metal@pinguholic.de

.gitignore

@@ -31,3 +31,5 @@ db/data/
 # IDE
 .vscode/
 .idea/
+pingu-concerts-prod-snapshot.dump
+pingu-concerts-uploads.tar.gz

compose.yml

@@ -3,30 +3,39 @@ services:
     image: postgres:17
     container_name: pingu-concerts-db
     restart: unless-stopped
+
     environment:
-      POSTGRES_DB: concerts
-      POSTGRES_USER: concerts
-      POSTGRES_PASSWORD: change-me-later
+      POSTGRES_DB: ${POSTGRES_DB}
+      POSTGRES_USER: ${POSTGRES_USER}
+      POSTGRES_PASSWORD: ${POSTGRES_PASSWORD}
+
     volumes:
       - postgres_data:/var/lib/postgresql/data
       - ./db/init:/docker-entrypoint-initdb.d:ro
 
+
   web:
     build: ./app
     container_name: pingu-concerts-web
     restart: unless-stopped
+
     ports:
       - "8080:8000"
+
     environment:
-      DATABASE_URL: postgresql://concerts:change-me-later@db:5432/concerts
-      INITIAL_ADMIN_USERNAME: kai
-      INITIAL_ADMIN_PASSWORD: test123
-      INITIAL_ADMIN_EMAIL: kai@local.invalid
+      DATABASE_URL: postgresql://${POSTGRES_USER}:${POSTGRES_PASSWORD}@db:5432/${POSTGRES_DB}
+
+      INITIAL_ADMIN_USERNAME: ${INITIAL_ADMIN_USERNAME}
+      INITIAL_ADMIN_PASSWORD: ${INITIAL_ADMIN_PASSWORD}
+      INITIAL_ADMIN_EMAIL: ${INITIAL_ADMIN_EMAIL}
+
     volumes:
       - concert_uploads:/app/static/uploads
+
     depends_on:
       - db
 
+
 volumes:
   postgres_data:
   concert_uploads: