Tighten context during build of nginx and simpleid
diff --git a/docker-compose.yml b/docker-compose.yml
index 94eb724..60e2230 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -2,8 +2,7 @@
 services:
   nginx:
     build:
-      context: .
-      dockerfile: nginx/Dockerfile
+      context: ./nginx/
       args:
         - SELFSIGNED_REQ_HOST=${SA_PUBLIC_DOMAIN_NAME}
         - SELFSIGNED_REQ_ALT_NAMES=DNS:${SA_PUBLIC_DOMAIN_NAME},
@@ -78,8 +77,7 @@
       - seed
   simpleid:
     build:
-      context: .
-      dockerfile: simpleid/Dockerfile
+      context: ./simpleid/
     env_file: environment
     networks:
       - simpleidnet