Add down-options configuration option

This new, optional configuration parameter allows for the specification of flags to be passed to the `docker-compose down` command. This is primarily intended to be used for passing the `--volumes` flag whith instructs docker-compose to also delete persistent volumes.

.github/workflows/main.yml

@@ -9,3 +9,4 @@ jobs:
       - uses: isbang/compose-action@v0.1
         with:
           compose-file: './docker/docker-compose.yml'
+          down-options: '--volumes'

README.md

@@ -8,6 +8,11 @@ This action runs your docker-compose file and clean up before action finished.
 
 **Optional** The name of the compose file. Default `"./docker-compose.yml"`.
 
+### `down-options`
+
+**Optional** Options to pass to the `docker-compose down` command during cleanup. Default is none. Primarily used to pass the `--volumes` flag if you want persistent volumes to be deleted as well during cleanup.
+
+
 ## Example usage
 
 ```yaml

action.yml

@@ -5,6 +5,10 @@ inputs:
     description: 'relative path to compose file'
     required: false
     default: './docker-compose.yml'
+  down-options:  # id of input
+    description: 'additional options to pass to `docker-compose down` command'
+    required: false
+    default: ''
 runs:
   using: 'node12'
   main: 'main.js'

post.js

@@ -4,13 +4,14 @@ const fs = require('fs');
 
 try {
   const composeFile = core.getInput('compose-file');
+  const downOptions = core.getInput('down-options');
 
   if (!fs.existsSync(composeFile)) {
     console.log(`${composeFile} not exists`);
     return
   }
 
-  compose.down({ config: composeFile, log: true })
+  compose.down({ config: composeFile, log: true, commandOptions: downOptions })
     .then(
       () => { console.log('compose removed')},
       err => { core.setFailed(`compose down failed ${err}`)}