Adding postgreSQL / pgAdmin example

Signed-off-by: Leon Stoldt <tech@leon-stoldt.de>

postgresql-pgadmin/docker-compose.yaml

@@ -0,0 +1,22 @@
+version: '3.7'
+services:
+  postgres:
+    container_name: postgres
+    image: postgres:latest
+    environment:
+      - POSTGRES_USER=${POSTGRES_USER}
+      - POSTGRES_PASSWORD=${POSTGRES_PW}
+      - POSTGRES_DB=${POSTGRES_DB} #optional (specify default database instead of $POSTGRES_USER)
+    ports:
+      - "5432:5432"
+    restart: always
+
+  pgadmin:
+    container_name: pgadmin
+    image: dpage/pgadmin4:latest
+    environment:
+      - PGADMIN_DEFAULT_EMAIL=${PGADMIN_MAIL}
+      - PGADMIN_DEFAULT_PASSWORD=${PGADMIN_PW}
+    ports:
+      - "5050:80"
+    restart: always