chore: Add docs about GCS Storage (#1560)

docs/self-hosted/storage/configuring-gcs.md

@@ -0,0 +1,75 @@
+---
+path: "/docs/self-hosted/storage/configuring-gcs"
+title: "Configure GCS as storage in Chatwoot"
+---
+
+Chatwoot supports Google Cloud storage as the storage provider. To enable GCS in Chatwoot, follow the below mentioned steps.
+
+Set google as the active storage service in the environment variables
+
+```bash
+ACTIVE_STORAGE_SERVICE='google'
+```
+
+### Get project ID variable
+
+Login to your Google Cloud console. On your home page of your project you will be able to see the project id and project name as follows.
+
+![get-your-project-id](./images/get-your-project-id.png)
+
+```bash
+GCS_PROJECT=your-project-id
+```
+
+### Setup GCS Bucket
+
+Go to Storage -> Browser. Click on "Create Bucket". You will be presented with a screen as shown below. Select the default values and continue.
+
+![create-a-bucket](./images/create-a-bucket.png)
+
+Once this is done you will get the bucket name. Set this as GCS_BUCKET.
+
+```
+GCS_BUCKET=your-bucket-name
+```
+
+### Setup a service account
+
+Go to `Identity & Services -> Identity -> Service Accounts`. Click on "Create Service Account".
+
+Provice a name and an ID for the service account, click on create. You will be asked to "Grant this service account access to the project" Select Cloud Storage -> Storage Admin as shown below.
+
+![storage-admin](./images/storage-admin.png)
+
+### Add service account to the bucket
+
+Go to Storage -> Browser -> Your bucket -> Permissions. Click on add. On "New members" field select the service account you just created.
+
+Select role as `Cloud Storage -> Storage Admin` and save.
+
+![permissions](./images/permissions.png)
+
+### Generate a key for the service account
+
+Go to `Identity & Services -> Identity -> Service Accounts -> Your service account`. There is a section called **Keys**. Click on **Add Key**. You will be presented with an option like the one below. Select JSON from the option.
+
+![json](./images/json.png)
+
+Copy the json file content and set it as GCS_CREDENTIALS
+
+A sample credential file is of the following format.
+
+```json
+{
+  "type": "service_account",
+  "project_id": "",
+  "private_key_id": "",
+  "private_key": "",
+  "client_email": "",
+  "client_id": "",
+  "auth_uri": "",
+  "token_uri": "",
+  "auth_provider_x509_cert_url": "",
+  "client_x509_cert_url": ""
+}
+```