docs: Add tips

README.md

@@ -8,11 +8,11 @@
 
 
 
-## GitHub Actions for Hugo extended and Modules
+## GitHub Actions for Hugo
 
 - [gohugoio/hugo: The world’s fastest framework for building websites.](https://github.com/gohugoio/hugo)
 
-We can run Hugo on a virtual machine of GitHub Actions by this Hugo action. Hugo extended version and Hugo Modules are supported.
+We can run **Hugo** on a virtual machine of **GitHub Actions** by this Hugo action. **Hugo extended** version and **Hugo Modules** are supported.
 
 From `v2.0.0`, this Hugo action migrated to a JavaScript (TypeScript)  action. We no longer build or pull a Hugo docker image. Thanks to this change, we can complete this action less than **4 sec**. (A docker base action was taking about 1 min or more execution time to build or pull.)
 
@@ -24,9 +24,12 @@ From `v2.0.0`, this Hugo action migrated to a JavaScript (TypeScript)  action. W
 |---|:---:|:---:|:---:|
 | Support | ✅️ | ✅️ | ✅️ |
 
+
+
+## Table of Contents
+
 <!-- START doctoc generated TOC please keep comment here to allow auto update -->
 <!-- DON'T EDIT THIS SECTION, INSTEAD RE-RUN doctoc TO UPDATE -->
-*Table of Contents*
 
 - [Getting started](#getting-started)
   - [⭐️ Create your workflow](#%EF%B8%8F-create-your-workflow)
@@ -72,7 +75,7 @@ jobs:
     - name: Setup Hugo
       uses: peaceiris/actions-hugo@v2.2.4
       with:
-        hugo-version: '0.58.3'
+        hugo-version: '0.59.1'
         # extended: true
 
     - name: Build
@@ -98,7 +101,7 @@ Set `extended: true` to use a Hugo extended version.
 - name: Setup Hugo
   uses: peaceiris/actions-hugo@v2.2.4
   with:
-    hugo-version: '0.58.3'
+    hugo-version: '0.59.1'
     extended: true
 ```
 
@@ -117,6 +120,36 @@ This action fetches the latest version of Hugo by [hugo | Homebrew Formulae](htt
 
 
 
+## Tips
+
+### Read Hugo version from file
+
+How to sync a Hugo version between Docker Compose YAML file and a GitHub Actions workflow using `.env` file.
+
+Write a `HUGO_VERSION` to the `.env` file like the following and push it to a remote branch.
+
+```sh
+HUGO_VERSION=0.59.1
+```
+
+Next, add a step to read a Hugo version from the `.env` file.
+
+```yaml
+    - name: Read .env
+      id: hugo-version
+      run: |
+        . ./.env
+        echo ::set-output name=HUGO_VERSION::${HUGO_VERSION}
+
+    - name: Setup Hugo
+      uses: peaceiris/actions-hugo@v2.2.4
+      with:
+        hugo-version: '${{ steps.hugo-version.outputs.HUGO_VERSION }}'
+        extended: true
+```
+
+
+
 ## License
 
 - [MIT License - peaceiris/actions-hugo]