add healthcheck to compose

compose.yml

@@ -2,13 +2,14 @@ services:
   migrations:
     restart: on-failure
     depends_on:
-      - ipld-eth-db
+      ipld-eth-db:
+        condition: service_healthy
     # Use local build
     build:
       context: .
       dockerfile: Dockerfile
     # Use an existing image
-    image: cerc/ipld-eth-db
+    image: cerc/ipld-eth-db:local
     environment:
       DATABASE_USER: "vdbm"
       DATABASE_NAME: "cerc_testing"
@@ -26,3 +27,8 @@ services:
       POSTGRES_PASSWORD: "password"
     ports:
       - "127.0.0.1:8077:5432"
+    healthcheck:
+      test: ["CMD", "pg_isready", "-U", "vdbm"]
+      interval: 2s
+      timeout: 1s
+      retries: 3