feat: add rules to image, doc

Dockerfile

@@ -1,11 +1,11 @@
 FROM node:11-stretch
 
-COPY docs/config-stderr.yml /root/.salty-dog.yml
+# copy config and rules, which change rarely
+COPY docs/config-docker.yml /root/.salty-dog.yml
+COPY rules /rules
+
+# copy package and bundle, which change often
 COPY package.json /salty-dog/package.json
 COPY out/bundle.js /salty-dog/out/bundle.js
 
-WORKDIR /salty-dog
-
-ENV PATH "${PATH}:/usr/local/lib/node_modules"
-
 ENTRYPOINT [ "node", "/salty-dog/out/bundle.js" ]

README.md

@@ -8,6 +8,7 @@ Or, as an acronym, JSON **s**chema **a**nalysis, **l**inting, and **t**ransforma
 - [SALTY DOG](#salty-dog)
   - [Build](#build)
   - [Usage](#usage)
+    - [Docker](#docker)
     - [Validate](#validate)
       - [Validate File](#validate-file)
       - [Validate URL](#validate-url)
@@ -57,6 +58,14 @@ ingress.extensions/gitlab created (dry run)
 
 ```
 
+### Docker
+
+The Docker container is published for each branch and tag, using the slug (`.` replaced with `-`, mostly). The latest
+semi-stable image is `ssube/salty-dog:master`.
+
+Rules are located in `/rules` within the image. To add your own rules, mount them with
+`-v ${HOME}/your-rules:/user-rules:ro` and include with `--rules /user-rules/rules.yml`.
+
 ### Validate
 
 `salty-dog` can validate JSON and YAML from files and streams, and emit it to a file or stream (with logs going

docs/config-docker.yml

@@ -0,0 +1,7 @@
+data:
+  logger:
+    level: info
+    name: salty-dog
+    streams:
+      - level: info
+        path: /tmp/salty-dog.log

src/index.ts

@@ -17,7 +17,7 @@ const RULE_OPTION: Options = {
   type: 'array',
 };
 
-const MAIN_ARGS = usage(`Usage: $0 <mode> [options]`)
+const MAIN_ARGS = usage(`Usage: salty-dog <mode> [options]`)
   .option(CONFIG_ARGS_NAME, {
     default: `.${VERSION_INFO.app.name}.yml`,
     group: 'Config:',
@@ -35,6 +35,7 @@ const MAIN_ARGS = usage(`Usage: $0 <mode> [options]`)
   .option('count', {
     alias: ['c'],
     default: false,
+    desc: 'Exit with error count',
     type: 'boolean',
   })
   .option('dest', {
@@ -56,6 +57,7 @@ const MAIN_ARGS = usage(`Usage: $0 <mode> [options]`)
   .option('rules', {
     alias: ['r'],
     default: [],
+    desc: 'Rules file',
     type: 'array',
   })
   .option('source', {