refactor: build only one frappe/erpnext image (#1032)

* ci: skip frappe builds

* refactor: build only one frappe/erpnext image

* fix: lint nginx entrypoint script

* docs: update and organize docs

* docs: fix lint errors

* fix(custom): pass base64 encoded apps json

* ci: update dependabot

* docs: update contributing

* docs: remove info about multi image setup

* fix: initiate empty common_site_config.json

default config has host keys set to localhost
causes connection errors

* docs: add details for pwd volumes

* fix: symlink assets instead of copy

* fix: nginx private files

* ci: skip docker compose v2 install for ubuntu-latest

* fix: organize layers

* feat: allow remove git remote for custom image

* docs: allow remove git remote for custom image

* fix: remove duplicate --apps_path

tests/test_frappe_docker.py

@@ -89,7 +89,13 @@ def test_frappe_connections_in_backends(
 ):
     filename = "_ping_frappe_connections.py"
     compose("cp", f"tests/{filename}", f"{service}:/tmp/")
-    compose.exec(service, python_path, f"/tmp/{filename}")
+    compose.exec(
+        "-w",
+        "/home/frappe/frappe-bench/sites",
+        service,
+        python_path,
+        f"/tmp/{filename}",
+    )
 
 
 def test_push_backup(