docs: added install method (#4875)

Signed-off-by: khanhtc1202 <khanhtc1202@gmail.com>

docs/content/en/docs-dev/quickstart/_index.md

@@ -45,6 +45,12 @@ sudo mv ./pipectl /usr/local/bin/pipectl
 asdf plugin add pipectl && asdf install pipectl latest && asdf global pipectl latest
 ```
 
+##### Method 3: [aqua](https://aquaproj.github.io/) Supported Installation
+
+```console
+aqua g -i pipe-cd/pipecd/pipectl && aqua i
+```
+
 #### 1.2. Installing PipeCD's components
 
 We can simply use __pipectl quickstart__ command to start the PipeCD installation process and follow the instruction

docs/content/en/docs-dev/user-guide/command-line-tool.md

@@ -64,6 +64,23 @@ You can use pipectl to add and sync applications, wait for a deployment status.
     pipectl version
     ```
 
+### [aqua](https://aquaproj.github.io/)
+
+1. Add pipectl to `aqua.yaml`. (If you want to select a version, use `aqua g -i -s pipe-cd/pipecd/pipectl`)
+    ```console
+    aqua g -i pipe-cd/pipecd/pipectl
+    ```
+
+2. Install pipectl.
+    ```console
+    aqua i
+    ```
+
+3. Test to ensure the version you installed is up-to-date.
+    ```console
+    pipectl version
+    ```
+
 ### Docker
 We are storing every version of docker image for pipectl on Google Cloud Container Registry.
 Available versions are [here](https://github.com/pipe-cd/pipecd/releases).

docs/content/en/docs-v0.47.x/quickstart/_index.md

@@ -45,6 +45,12 @@ sudo mv ./pipectl /usr/local/bin/pipectl
 asdf plugin add pipectl && asdf install pipectl latest && asdf global pipectl latest
 ```
 
+##### Method 3: [aqua](https://aquaproj.github.io/) Supported Installation
+
+```console
+aqua g -i pipe-cd/pipecd/pipectl && aqua i
+```
+
 #### 1.2. Installing PipeCD's components
 
 We can simply use __pipectl quickstart__ command to start the PipeCD installation process and follow the instruction

docs/content/en/docs-v0.47.x/user-guide/command-line-tool.md

@@ -64,6 +64,23 @@ You can use pipectl to add and sync applications, wait for a deployment status.
     pipectl version
     ```
 
+### [aqua](https://aquaproj.github.io/)
+
+1. Add pipectl to `aqua.yaml`. (If you want to select a version, use `aqua g -i -s pipe-cd/pipecd/pipectl`)
+    ```console
+    aqua g -i pipe-cd/pipecd/pipectl
+    ```
+
+2. Install pipectl.
+    ```console
+    aqua i
+    ```
+
+3. Test to ensure the version you installed is up-to-date.
+    ```console
+    pipectl version
+    ```
+
 ### Docker
 We are storing every version of docker image for pipectl on Google Cloud Container Registry.
 Available versions are [here](https://github.com/pipe-cd/pipecd/releases).