🐳 : Improving Docker Build (#1415)

* Improving builds

When adding LibreChat to ansible, it rebuilt way too often, even if I
only changed the configuration.
With this PR, it should build only when the files of the app change.
Also removed the 'volumes' section for the 'api' in the docker-compose.yml.
At least with our installation it works fine like this.

* @danny-avila's comments

- removed 'env_file' from docker-compose.yml
- re-added link to '.env' in volumes

* Adding latest changes from main

* @danny-avila's comments

* Updating installation instructions

* @danny-avila's comments

- Remove unused environment in docker-compose.yml
- Re-add some steps for cleaning docker images

Dockerfile

@@ -1,17 +1,15 @@
 # Base node image
-FROM node:19-alpine AS node
+FROM node:18-alpine AS node
 
 COPY . /app
 WORKDIR /app
 
+# Allow mounting of these files, which have no default
+# values.
+RUN touch .env librechat.yaml
 # Install call deps - Install curl for health check
 RUN apk --no-cache add curl && \
-    # We want to inherit env from the container, not the file
-    # This will preserve any existing env file if it's already in source
-    # otherwise it will create a new one
-    touch .env && \
-    # Build deps in seperate 
-    npm ci
+    npm ci 
 
 # React client build
 ENV NODE_OPTIONS="--max-old-space-size=2048"