Merge pull request #2030 from Infisical/doc/added-guide-for-configuring-certs

doc: added guide for configuring certs

docs/integrations/cicd/gitlab.mdx

@@ -77,11 +77,12 @@ description: "How to sync secrets from Infisical to GitLab"
         </Steps>
       </Accordion>
     </AccordionGroup>
+
   </Tab>
   <Tab title="Self-Hosted Setup">
     Using the GitLab integration on a self-hosted instance of Infisical requires configuring an application in GitLab
     and registering your instance with it.
-    
+    <Tip>If you're self-hosting Gitlab with custom certificates, you will have to configure your Infisical instance to trust these certificates. To learn how, please follow [this guide](../../self-hosting/guides/custom-certificates).</Tip>
     <Steps>
       <Step title="Create an OAuth application in GitLab">
         Navigate to your user Settings > Applications to create a new GitLab application.
@@ -111,6 +112,6 @@ description: "How to sync secrets from Infisical to GitLab"
         Once added, restart your Infisical instance and use the GitLab integration.
       </Step>
     </Steps>
+
   </Tab>
 </Tabs>
-

docs/mint.json

@@ -222,7 +222,8 @@
           "group": "Guides",
           "pages": [
             "self-hosting/configuration/schema-migrations",
-            "self-hosting/guides/mongo-to-postgres"
+            "self-hosting/guides/mongo-to-postgres",
+            "self-hosting/guides/custom-certificates"
           ]
         },
         {

docs/self-hosting/guides/custom-certificates.mdx

@@ -0,0 +1,26 @@
+---
+title: "Adding Custom Certificates"
+description: "Learn how to configure Infisical with custom certificates"
+---
+
+By default, the Infisical Docker image includes certificates from well-known public certificate authorities.
+However, some integrations with Infisical may need to communicate with your internal services that use private certificate authorities. 
+To configure trust for custom certificates, follow these steps. This is particularly useful for connecting Infisical with self-hosted services like GitLab.
+
+## Prerequisites
+
+- Docker
+- Standalone [Infisical image](https://hub.docker.com/r/infisical/infisical)
+- Certificate public key `.pem` files
+
+## Setup
+
+1. Place all your public key `.pem` files into a single directory.
+2. Mount the directory containing the `.pem` files to the `usr/local/share/ca-certificates/` path in the Infisical container.
+3. Set the following environment variable on your Infisical container:
+   ```
+   NODE_EXTRA_CA_CERTS=/etc/ssl/certs/ca-certificates.crt
+   ```
+4. Start the Infisical container.
+
+By following these steps, your Infisical container will trust the specified certificates, allowing you to securely connect Infisical to your internal services.