chore: replace --production npm arg with --omit=dev

Author: Fdawgs

Dockerfile

@@ -7,7 +7,7 @@ WORKDIR /usr/app
 COPY . .
 # Curl needed for healthcheck command
 RUN apk add --no-cache curl && \
-    npm ci --production --ignore-scripts && \
+    npm ci --ignore-scripts --omit=dev && \
     npm cache clean --force
 
 # Node images provide 'node' unprivileged user to run apps and prevent

README.md

@@ -50,7 +50,7 @@ Perform the following steps before deployment:
 
 ### Standard Deployment
 
-1. Run `npm ci --ignore-scripts --production` to install dependencies
+1. Run `npm ci --ignore-scripts --omit=dev` to install dependencies
 2. Run `npm start`
 
 The service should be up and running on the port set in the config. You should see output similar to the following in stdout or in the log file specified using the `LOG_ROTATION_FILENAME` environment variable:
@@ -97,7 +97,7 @@ This requires [Docker](https://www.docker.com) installed.
 
 If you are unable to deploy this into production using Docker, it is recommended that you use a process manager such as [PM2](https://pm2.keymetrics.io/).
 
-1. Run `npm ci --ignore-scripts --production` to install dependencies
+1. Run `npm ci --ignore-scripts --omit=dev` to install dependencies
 2. Run `npm i -g pm2` to install pm2 globally
 3. Launch application with `pm2 start .pm2.config.js`
 4. Check the application has been deployed using `pm2 list` or `pm2 monit`