Add jekyll input option (#116)

GitHub Pages will use Jekyll to build your site by default. This input
option allows for this functionality to be disabled. The option is left
to `true` by default as setting to `false` will cause the `.nojekyll`
file to be written to the output directory.

https://help.github.com/en/github/working-with-github-pages/about-github-pages#static-site-generators

README.md

@@ -133,6 +133,7 @@ Following inputs can be used as `step.with` keys
 | `author`             | String  | Author name and email address as `Display Name <joe@foo.bar>` (defaults to the GitHub Actions bot user) |
 | `commit_message`     | String  | Commit message (default `Deploy to GitHub pages`)                           |
 | `fqdn`               | String  | Write the given domain name to the CNAME file                               |
+| `jekyll`             | Bool    | Allow Jekyll to build your site (default `true`)                            |
 
 ### environment variables
 

action.yml

@@ -37,6 +37,10 @@ inputs:
   fqdn:
     description: 'Write the given domain name to the CNAME file'
     required: false
+  jekyll:
+    description: 'Allow Jekyll to build your site'
+    default: 'true'
+    required: false
 
 runs:
   using: 'node12'

src/main.ts

@@ -17,6 +17,7 @@ async function run() {
     const author: string = core.getInput('author') || git.defaults.author;
     const commitMessage: string = core.getInput('commit_message') || git.defaults.message;
     const fqdn: string = core.getInput('fqdn');
+    const jekyll: boolean = /false/i.test(core.getInput('jekyll'));
 
     if (!fs.existsSync(buildDir)) {
       core.setFailed('Build dir does not exist');
@@ -63,6 +64,11 @@ async function run() {
       await fs.writeFileSync(path.join(tmpdir, 'CNAME'), fqdn.trim());
     }
 
+    if (jekyll) {
+      core.info(`🚫 Disabling Jekyll support via ${path.join(tmpdir, '.nojekyll')}`);
+      await fs.writeFileSync(path.join(tmpdir, '.nojekyll'), '');
+    }
+
     const isDirty: boolean = await git.isDirty();
     core.debug(`isDirty=${isDirty}`);
     if (keepHistory && remoteBranchExists && !isDirty) {