pin PG version on docker compose files (#300)

docker-compose-dev.yaml

@@ -43,7 +43,7 @@ services:
     depends_on:
       - selenium_hub
   db:
-    image: postgres
+    image: postgres:13
     volumes:
       - ../postgres_data:/var/lib/postgresql/data/
     restart: always

docker-compose-http-proxy.yaml

@@ -68,7 +68,7 @@ services:
     depends_on:
       - migrations
   db:
-    image: postgres
+    image: postgres:13
     volumes:
       - ../postgres_data/:/var/lib/postgresql/data/
     restart: always

docker-compose-https-proxy.yaml

@@ -70,7 +70,7 @@ services:
     depends_on:
       - migrations
   db:
-    image: postgres
+    image: postgres:13
     volumes:
       - ../postgres_data/:/var/lib/postgresql/data/
     restart: always

docker-compose-letsencrypt.yaml

@@ -90,7 +90,7 @@ services:
     depends_on:
       - migrations
   db:
-    image: postgres
+    image: postgres:13
     volumes:
       - ../postgres_data:/var/lib/postgresql/data/
     restart: always

docker-compose-named-volumes.yaml

@@ -66,7 +66,7 @@ services:
     depends_on:
       - migrations
   db:
-    image: postgres
+    image: postgres:13
     volumes:
       - postgres_data:/var/lib/postgresql/data/
     restart: always

docker-compose.yaml

@@ -62,7 +62,7 @@ services:
     depends_on:
       - migrations
   db:
-    image: postgres
+    image: postgres:13
     volumes:
       - ../postgres_data:/var/lib/postgresql/data/
     restart: always