Added a docker image and compose file for the application

docker-compose.yml

@@ -0,0 +1,33 @@
+services:
+
+  openarchival.blazor:
+    image: ${DOCKER_REGISTRY-}openarchivalblazor
+    build:
+      context: .
+      dockerfile: OpenArchival.Blazor/Dockerfile
+    environment:
+        - ConnectionStrings__DefaultConnection=Host=db;Port=5432;Database=postgres;Username=postgres;Password=postgres
+    depends_on: 
+        db:
+            condition: service_healthy
+
+  db:
+    image: postgres:latest
+    restart: always
+    environment:
+        - POSTGRES_USER=postgres
+        - POSTGRES_PASSWORD=postgres
+        - POSTGRES_DB=postgres
+    ports: 
+        - 5432:5432
+    volumes:
+        - postgres_data:/var/lib/postgresql/data
+    healthcheck:
+        test: ["CMD-SHELL", "pg_isready -U postgres -d postgres"]
+        interval: 10s
+        timeout: 5s
+        retries: 5
+        
+volumes:
+  postgres_data:
+