fix: set default values in the entrypoint

The action.yml metadata default values for the branches input
wont work if you happen to be referencing a docker image

action.yml

@@ -12,17 +12,6 @@ inputs:
       'The branches on which releases should happen.
       https://github.com/semantic-release/semantic-release/blob/master/docs/usage/configuration.md#branches'
     required: false
-    default: |
-      [
-        'master',
-        'main',
-        'next',
-        'next-major',
-        '+([0-9])?(.{+([0-9]),x}).x',
-        { name: 'beta', prerelease: true },
-        { name: 'alpha', prerelease: true },
-        { name: 'canary', prerelease: true },
-      ]
   extends:
     description:
       'String or array of modules or file paths containing a shareable configuration.
@@ -91,3 +80,12 @@ outputs:
 runs:
   using: 'docker'
   image: 'Dockerfile'
+  args:
+    - ${{ inputs.branches }}
+    - ${{ inputs.extends }}
+    - ${{ inputs.plugins }}
+    - ${{ inputs.additional-packages }}
+    - ${{ inputs.dry-run }}
+    - ${{ inputs.repository-url }}
+    - ${{ inputs.tag-format }}
+    - ${{ inputs.branch }}

entrypoint.js

@@ -4,11 +4,11 @@ import semanticRelease from 'semantic-release';
 import JSON5 from 'json5';
 import arrify from 'arrify';
 
-const parseInput = (input) => {
+const parseInput = (input, defaultValue = '') => {
   try {
     return JSON5.parse(input);
   } catch (err) {
-    return input;
+    return defaultValue || input;
   }
 };
 
@@ -74,7 +74,16 @@ const setGitConfigSafeDirectory = () => {
  */
 async function run() {
   const branch = parseInput(core.getInput('branch', { required: false }));
-  const branches = parseInput(core.getInput('branches', { required: false }));
+  const branches = parseInput(core.getInput('branches', { required: false }), [
+    'master',
+    'main',
+    'next',
+    'next-major',
+    '+([0-9])?(.{+([0-9]),x}).x',
+    { name: 'beta', prerelease: true },
+    { name: 'alpha', prerelease: true },
+    { name: 'canary', prerelease: true },
+  ]);
   const plugins = parseInput(core.getInput('plugins', { required: false }));
   const additionalPackages =
     parseInput(core.getInput('additional-packages', { required: false })) || [];