Add a default config file.

.github/dependency-review-config.yml

@@ -0,0 +1 @@
+fail-on-severity: low

src/config.ts

@@ -5,7 +5,7 @@ import * as core from '@actions/core'
 import * as z from 'zod'
 import {ConfigurationOptions, SEVERITIES} from './schemas'
 
-export const CONFIG_FILEPATH = './.github/dependency-review.yml'
+export const CONFIG_FILEPATH = './.github/dependency-review-config.yml'
 
 function getOptionalInput(name: string): string | undefined {
   const value = core.getInput(name)

src/schemas.ts

@@ -35,6 +35,7 @@ export const ConfigurationOptionsSchema = z
     fail_on_severity: z.enum(SEVERITIES).default('low'),
     allow_licenses: z.array(z.string()).default([]),
     deny_licenses: z.array(z.string()).default([]),
+    config_file: z.string().optional().default('false'),
     base_ref: z.string(),
     head_ref: z.string()
   })