Add docker support instructions to the docs.

Author: cotes2020

Diff for: README.md

@@ -72,6 +72,14 @@ In order to generate some extra files (_categories_, _tags_ and _last modified l
   $ brew install coreutils
   ```
 
+### Setting up Docker environment (optional)
+
+If you're a loyal fan of [**Docker**](https://www.docker.com/) or just too lazy to install the packages mentioned in [_Setting up the local envrionment_](#setting-up-the-local-envrionment), please make sure you have **Docker Engine** installed and running, and then get Docker image `jekyll/jekyll` from Docker Hub by the following command:
+
+```console
+$ docker pull jekyll/jekyll:latest
+```
+
 ## Usage
 
 Running [**Chirpy**](https://github.com/cotes2020/jekyll-theme-chirpy/) requires some extra files, which cannot be generated by Jekyll native commands, so please strictly follow the methods mentioned below to run or deploy your website.
@@ -119,6 +127,19 @@ Then open a browser and visit to <http://localhost:4000>.
 
 Few days later, you may find that the file changes does not refresh in real time by using `run.sh`. Don't worry, the advanced option `-r` (or `--realtime`) will solve this problem, but it requires [**fswatch**](http://emcrisostomo.github.io/fswatch/) to be installed on your machine.
 
+### Run on Docker
+
+Run the site on Docker with the following command:
+
+```terminal
+$ docker run --rm -it \
+    --volume="$PWD:/srv/jekyll" \
+    -p 4000:4000 jekyll/jekyll \
+    bash tools/run.sh --docker
+```
+
+Please note that on Docker containers, you'll lose the real-time refresh feature.
+
 ### Deployment
 
 Before the deployment begins, checkout the file `_config.yml` and make sure the `url` is configured correctly. Furthermore, if you prefer the [_project site_](https://help.github.com/en/github/working-with-github-pages/about-github-pages#types-of-github-pages-sites) and don't use a custom domain, or you want to visit your website with a base url on a web server other than **GitHub Pages**, remember to change the `baseurl` to your project name that starting with a slash. For example, `/project`.
@@ -131,8 +152,7 @@ For security reasons, GitHub Pages build runs on `safe` mode, which restricts us
 
 1. Push any commit to `origin/master` to trigger the GitHub Actions workflow. Once the build is complete and successful, a new remote branch named `gh-pages` will appear to store the built site files.
 
-2. Browse to your repository on GitHub and choose the branch `gh-pages` as the [publishing source](https://docs.github.com/en/github/working-with-github-pages/configuring-a-publishing-source-for-your-github-pages-site) throught _Settings_
- → _Options_ → _GitHub Pages_:
+2. Browse to your repository on GitHub and choose the branch `gh-pages` as the [publishing source](https://docs.github.com/en/github/working-with-github-pages/configuring-a-publishing-source-for-your-github-pages-site) throught _Settings_ → _Options_ → _GitHub Pages_:
     ![gh-pages-sources](https://raw.githubusercontent.com/cotes2020/jekyll-theme-chirpy/master/assets/img/sample/gh-pages-sources.png)
 
 3. Visit your website at the address indicated by GitHub.
@@ -144,10 +164,21 @@ On platforms other than GitHub, we cannot enjoy the convenience of **GitHub Acti
 Go to the root of the source project, build your site by:
 
 ```console
-$ bash tools/build.sh -d /path/to/site/
+$ bash tools/build.sh
+```
+
+> **Note**: The output path can be specified with the option `-d`.
+
+Or, build the site with Docker by:
+
+```terminal
+$ docker run --rm -it \
+    --volume="$PWD:/srv/jekyll" \
+    jekyll/jekyll \
+    bash tools/build.sh --docker
 ```
 
-The generated site files will be placed in folder `/path/to/site/`. Now you should upload those files to your web server.
+Unless you specified the output path, the generated site files will be placed in folder `_site` of the project's root directory. Now you should upload those files to your web server.
 
 ### Documentation
 

Diff for: _posts/2019-08-09-getting-started.md

@@ -42,6 +42,14 @@ In order to generate some extra files (_categories_, _tags_ and _last modified l
   $ brew install coreutils
   ```
 
+### Setting up Docker environment (optional)
+
+If you're a loyal fan of [**Docker**](https://www.docker.com/) or just too lazy to install the packages mentioned in [_Setting up the local envrionment_](#setting-up-the-local-envrionment), please make sure you have **Docker Engine** installed and running, and then get Docker image `jekyll/jekyll` from Docker Hub by the following command:
+
+```console
+$ docker pull jekyll/jekyll:latest
+```
+
 ## Usage
 
 Running [**Chirpy**](https://github.com/cotes2020/jekyll-theme-chirpy/) requires some extra files, which cannot be generated by Jekyll native commands, so please strictly follow the methods mentioned below to run or deploy your website.
@@ -89,6 +97,19 @@ Then open a browser and visit to <http://localhost:4000>.
 
 Few days later, you may find that the file changes does not refresh in real time by using `run.sh`. Don't worry, the advanced option `-r` (or `--realtime`) will solve this problem, but it requires [**fswatch**](http://emcrisostomo.github.io/fswatch/) to be installed on your machine.
 
+### Run on Docker
+
+Run the site on Docker with the following command:
+
+```terminal
+$ docker run --rm -it \
+    --volume="$PWD:/srv/jekyll" \
+    -p 4000:4000 jekyll/jekyll \
+    bash tools/run.sh --docker
+```
+
+Please note that on Docker containers, you'll lose the real-time refresh feature.
+
 ### Deployment
 
 Before the deployment begins, checkout the file `_config.yml` and make sure the `url` is configured correctly. Furthermore, if you prefer the [_project site_](https://help.github.com/en/github/working-with-github-pages/about-github-pages#types-of-github-pages-sites) and don't use a custom domain, or you want to visit your website with a base url on a web server other than **GitHub Pages**, remember to change the `baseurl` to your project name that starting with a slash. For example, `/project`.
@@ -101,8 +122,7 @@ For security reasons, GitHub Pages build runs on `safe` mode, which restricts us
 
 1. Push any commit to `origin/master` to trigger the GitHub Actions workflow. Once the build is complete and successful, a new remote branch named `gh-pages` will appear to store the built site files.
 
-2. Browse to your repository on GitHub and choose the branch `gh-pages` as the [publishing source](https://docs.github.com/en/github/working-with-github-pages/configuring-a-publishing-source-for-your-github-pages-site) throught _Settings_
- → _Options_ → _GitHub Pages_:
+2. Browse to your repository on GitHub and choose the branch `gh-pages` as the [publishing source](https://docs.github.com/en/github/working-with-github-pages/configuring-a-publishing-source-for-your-github-pages-site) throught _Settings_ → _Options_ → _GitHub Pages_:
     ![gh-pages-sources](/assets/img/sample/gh-pages-sources.png){: width="650"}
 
 3. Visit your website at the address indicated by GitHub.
@@ -114,7 +134,18 @@ On platforms other than GitHub, we cannot enjoy the convenience of **GitHub Acti
 Go to the root of the source project, build your site by:
 
 ```console
-$ bash tools/build.sh -d /path/to/site/
+$ bash tools/build.sh
+```
+
+> **Note**: The output path can be specified with the option `-d`.
+
+Or, build the site with Docker by:
+
+```terminal
+$ docker run --rm -it \
+    --volume="$PWD:/srv/jekyll" \
+    jekyll/jekyll \
+    bash tools/build.sh --docker
 ```
 
-The generated site files will be placed in folder `/path/to/site/`. Now you should upload those files to your web server.
+Unless you specified the output path, the generated site files will be placed in folder `_site` of the project's root directory. Now you should upload those files to your web server.