Add initial action metadata with code

.gitignore

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+node_modules

action.yml

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+name: 'JSON Format'
+author: 'Gabriel Bourgeois'
+description: 'Formats a JSON file'
+inputs:
+  file:
+    description: 'The path of the file to format'
+    required: true
+  space:
+    description: 'The spacing to use when formatting the JSON'
+    required: false
+    default: 2
+runs:
+  using: 'node16'
+  main: 'index.js'

index.js

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+const core = require('@actions/core')
+const github = require('@actions/github')
+const fs = require('fs')
+
+try {
+  const file = core.getInput('file')
+  const space = Number(core.getInput('space'))
+
+  const original = fs.readFileSync(file, { encoding: 'utf8' })
+  const formatted = JSON.stringify(JSON.parse(original), null, space)
+
+  fs.writeFileSync(file, formatted)
+} catch (error) {
+  core.setFailed(error)
+}