docs: add FAQ entry about 500 error page when opening workflow edito (#624)

## 📝 Description
Add FAQ notice on v1.4 CE and EE about a problem that happens when
opening the workflow editor the first time

See #620 for error
details

## ✅ Checklist
- [X] I have tested this change
- [ ] This change requires documentation update

Author: TomFern

docs/versioned_docs/version-CE/getting-started/faq.md

@@ -4,12 +4,6 @@ description: Frequently Asked Questions
 
 # FAQ
 
-
-
-
-
-
-
 This page contains Frequently Asked Questions.
 
 ## Architecture
@@ -256,6 +250,21 @@ Some commands like `bash -e` or `set -x otrace` may override this behavior and m
 
 ## Project
 
+### When I try to edit the workflow, I get a 500 error page (workflow editor button)?
+
+This can happen if no [initialization machine](../using-semaphore/pipelines#init-job) is defined. To fix the error, follow these steps:
+
+1. Open the server menu and press **Settings**
+2. Select **Initialiation jobs** on the left menu
+3. Unsure at least **Environment type** and **Machine type** are select
+4. Press **Save changes** *even it the correct options were already selected*
+
+:::note
+
+Even if the correct options are selected, press **Save changes** to ensure they are applied.
+
+:::
+
 ### Can I transfer ownership of a project?
 
 Yes. The following conditions need to be met:

docs/versioned_docs/version-EE/getting-started/faq.md

@@ -4,12 +4,6 @@ description: Frequently Asked Questions (EE)
 
 # FAQ
 
-
-
-
-
-
-
 This page contains Frequently Asked Questions.
 
 ## Architecture
@@ -256,6 +250,21 @@ Some commands like `bash -e` or `set -x otrace` may override this behavior and m
 
 ## Project
 
+### When I try to edit the workflow, I get a 500 error page (workflow editor button)?
+
+This can happen if no [initialization machine](../using-semaphore/pipelines#init-job) is defined. To fix the error, follow these steps:
+
+1. Open the server menu and press **Settings**
+2. Select **Initialiation jobs** on the left menu
+3. Unsure at least **Environment type** and **Machine type** are select
+4. Press **Save changes** *even it the correct options were already selected*
+
+:::note
+
+Even if the correct options are selected, press **Save changes** to ensure they are applied.
+
+:::
+
 ### Can I transfer ownership of a project?
 
 Yes. The following conditions need to be met: