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

docs/migrate-from-multi-image-setup.md

@@ -0,0 +1,115 @@
+## Migrate from multi-image setup
+
+All the containers now use same image. Use `frappe/erpnext` instead of `frappe/frappe-worker`, `frappe/frappe-nginx` , `frappe/frappe-socketio` , `frappe/erpnext-worker` and `frappe/erpnext-nginx`.
+
+Now you need to specify command and environment variables for following containers:
+
+### Frontend
+
+For `frontend` service to act as static assets frontend and reverse proxy, you need to pass `nginx-entrypoint.sh` as container `command` and `BACKEND` and `SOCKETIO` environment variables pointing `{host}:{port}` for gunicorn and websocket services. Check [environment variables](environment-variables.md)
+
+Now you only need to mount the `sites` volume at location `/home/frappe/frappe-bench/sites`. No need for `assets` volume and asset population script or steps.
+
+Example change:
+
+```yaml
+# ... removed for brevity
+frontend:
+  image: frappe/erpnext:${ERPNEXT_VERSION:?ERPNext version not set}
+  command:
+    - nginx-entrypoint.sh
+  environment:
+    BACKEND: backend:8000
+    SOCKETIO: websocket:9000
+  volumes:
+    - sites:/home/frappe/frappe-bench/sites
+# ... removed for brevity
+```
+
+### Websocket
+
+For `websocket` service to act as socketio backend, you need to pass `["node", "/home/frappe/frappe-bench/apps/frappe/socketio.js"]` as container `command`
+
+Example change:
+
+```yaml
+# ... removed for brevity
+websocket:
+  image: frappe/erpnext:${ERPNEXT_VERSION:?ERPNext version not set}
+  command:
+    - node
+    - /home/frappe/frappe-bench/apps/frappe/socketio.js
+# ... removed for brevity
+```
+
+### Configurator
+
+For `configurator` service to act as run once configuration job, you need to pass `["bash", "-c"]` as container `entrypoint` and bash script inline to yaml. There is no `configure.py` in the container now.
+
+Example change:
+
+```yaml
+# ... removed for brevity
+configurator:
+  image: frappe/erpnext:${ERPNEXT_VERSION:?ERPNext version not set}
+  restart: "no"
+  entrypoint:
+    - bash
+    - -c
+  command:
+    - >
+      bench set-config -g db_host $$DB_HOST;
+      bench set-config -gp db_port $$DB_PORT;
+      bench set-config -g redis_cache "redis://$$REDIS_CACHE";
+      bench set-config -g redis_queue "redis://$$REDIS_QUEUE";
+      bench set-config -g redis_socketio "redis://$$REDIS_SOCKETIO";
+      bench set-config -gp socketio_port $$SOCKETIO_PORT;
+  environment:
+    DB_HOST: db
+    DB_PORT: "3306"
+    REDIS_CACHE: redis-cache:6379
+    REDIS_QUEUE: redis-queue:6379
+    REDIS_SOCKETIO: redis-socketio:6379
+    SOCKETIO_PORT: "9000"
+# ... removed for brevity
+```
+
+### Site Creation
+
+For `create-site` service to act as run once site creation job, you need to pass `["bash", "-c"]` as container `entrypoint` and bash script inline to yaml. Make sure to use `--no-mariadb-socket` as upstream bench is installed in container.
+
+The `WORKDIR` has changed to `/home/frappe/frappe-bench` like `bench` setup we are used to. So the path to find `common_site_config.json` has changed to `sites/common_site_config.json`.
+
+Example change:
+
+```yaml
+# ... removed for brevity
+create-site:
+  image: frappe/erpnext:${ERPNEXT_VERSION:?ERPNext version not set}
+  restart: "no"
+  entrypoint:
+    - bash
+    - -c
+  command:
+    - >
+      wait-for-it -t 120 db:3306;
+      wait-for-it -t 120 redis-cache:6379;
+      wait-for-it -t 120 redis-queue:6379;
+      wait-for-it -t 120 redis-socketio:6379;
+      export start=`date +%s`;
+      until [[ -n `grep -hs ^ sites/common_site_config.json | jq -r ".db_host // empty"` ]] && \
+        [[ -n `grep -hs ^ sites/common_site_config.json | jq -r ".redis_cache // empty"` ]] && \
+        [[ -n `grep -hs ^ sites/common_site_config.json | jq -r ".redis_queue // empty"` ]];
+      do
+        echo "Waiting for sites/common_site_config.json to be created";
+        sleep 5;
+        if (( `date +%s`-start > 120 )); then
+          echo "could not find sites/common_site_config.json with required keys";
+          exit 1
+        fi
+      done;
+      echo "sites/common_site_config.json found";
+      bench new-site frontend --no-mariadb-socket --admin-password=admin --db-root-password=admin --install-app payments --install-app erpnext --set-default;
+
+# ... removed for brevity
+```