Fix templates screen loading failure when vault references deleted access key

[Copilot]

When a template vault references a deleted access key, GetTemplates fails with 404, causing the frontend to hang in infinite loading state. Users encounter this after deleting vault passwords that templates still reference.

Changes

• db/TemplateVault.go: Modified FillTemplateVault to catch ErrNotFound when fetching missing access keys

  • Returns successfully with nil vault instead of propagating error
  • Logs warning with vault/key/project IDs for troubleshooting
  • Other errors still propagate normally

• db/bolt/template_vault_test.go: Added TestGetTemplateVaults_WithMissingAccessKey to verify templates load with orphaned vault references

Behavior

Before:

vault, err := d.GetAccessKey(projectID, *templateVault.VaultKeyID)
if err != nil {
    return  // Fails entire GetTemplates request
}

After:

vault, err := d.GetAccessKey(projectID, *templateVault.VaultKeyID)
if err != nil {
    if errors.Is(err, ErrNotFound) {
        log.Warn("Template vault references non-existent access key")
        return nil  // Continue loading templates
    }
    return  // Propagate other errors
}

Templates now load successfully even when vault keys have been deleted, with templateVault.Vault remaining nil for missing keys.

Original prompt

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This section details on the original issue you should resolve

<issue_title>Problem: Templates screen stuck in loading</issue_title>
<issue_description>### Issue

The templates screen was stuck in loading.
Also when I opened the templates via the dashboard (direct link) and hit the edit button it got stuck.

It seems the issue was that i created a vault password (which didn't seem to work) but moved on to variable groups with a secret. When I added the VG the templates screen did not get out of the loading loop anymore.

I have deleted the vault entries from the sqlite database:
delete from project__template_vault;

After this the templates screen is showing and I can edit my templates again.

Other info:
Version: v2.16.32-d2c2b4a-1760089605
Sqlite database (not BoltDB)

Impact

Web-Frontend (what users interact with)

Installation method

Docker

Database

BoltDB

Browser

Chrome

Semaphore Version

v2.16.32-d2c2b4a-1760089605

Ansible Version

ansible 2.10.8

Logs & errors

Nothing was being logged.
I only got a 404 in the development view of my browser.

Manual installation - system information

No response

Configuration

No response

Additional information

No response</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Problem: Templates screen stuck in loading #3366

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