tests: factor out base nginx-proxy config

test/test_internal/compose.base.override.yml

@@ -0,0 +1,5 @@
+services:
+  nginx-proxy:
+    volumes:
+      - /var/run/docker.sock:/tmp/docker.sock:ro
+      - ${PYTEST_MODULE_PATH}/network_internal.conf:/etc/nginx/network_internal.conf:ro

test/test_internal/test_internal-per-vhost.yml

@@ -15,9 +15,3 @@ services:
     environment:
       WEB_PORTS: "82"
       VIRTUAL_HOST: web2.nginx-proxy.example
-
-  sut:
-    image: nginxproxy/nginx-proxy:test
-    volumes:
-      - /var/run/docker.sock:/tmp/docker.sock:ro
-      - ./network_internal.conf:/etc/nginx/network_internal.conf:ro

test/test_internal/test_internal-per-vpath.yml

@@ -20,8 +20,3 @@ services:
       VIRTUAL_PATH: /web2/
       VIRTUAL_DEST: /
 
-  sut:
-    image: nginxproxy/nginx-proxy:test
-    volumes:
-      - /var/run/docker.sock:/tmp/docker.sock:ro
-      - ./network_internal.conf:/etc/nginx/network_internal.conf:ro