chore: Add maintenance mode flag

[kyle-ssg]

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• I have read the Contributing Guide.
• I have added information to docs/ if required so people know about the feature.
• I have filled in the "Changes" section below.
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Changes

Adds maintenance_mode flag as an option to turn on maintenance mode

How did you test this code?

Turned on the flag for the staging environment

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Project	Deployment	Actions	Updated (UTC)
flagsmith-frontend-preview	Ready	Preview, Comment	May 6, 2026 9:48am
flagsmith-frontend-staging	Ready	Preview, Comment	May 6, 2026 9:48am

1 Skipped Deployment

Project	Deployment	Actions	Updated (UTC)
docs	Ignored		May 6, 2026 9:48am

[github-actions]

Docker builds report

Image	Build Status	Security report
ghcr.io/flagsmith/flagsmith-api-test:pr-7435	Finished ✅	Skipped
ghcr.io/flagsmith/flagsmith-e2e:pr-7435	Finished ✅	Skipped
ghcr.io/flagsmith/flagsmith-api:pr-7435	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith-private-cloud:pr-7435	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith-frontend:pr-7435	Finished ✅	Results ✅

[chromatic-com]

Important

Testing in progress…

🟢 UI Tests: 284 tests unchanged
⏳ UI Review: Comparing 142 stories…
Storybook Publish: 142 stories published

[chromatic-com]

Tip

All tests passed and all changes approved!

🟢 UI Tests: 284 tests unchanged
🟢 UI Review: 142 stories published -- no changes
Storybook Publish: 142 stories published

[github-actions]

Playwright Test Results (oss - depot-ubuntu-latest-16)

 11 passed

Details

 11 tests across 8 suites
 23.9 seconds
 f622be2
 🔄 Run: #16544 (attempt 1)

Playwright Test Results (oss - depot-ubuntu-latest-arm-16)

 11 passed

Details

 11 tests across 8 suites
 50.2 seconds
 f622be2
 🔄 Run: #16544 (attempt 1)

Playwright Test Results (private-cloud - depot-ubuntu-latest-arm-16)

 17 passed

Details

 17 tests across 14 suites
 1 minute, 5 seconds
 f622be2
 🔄 Run: #16544 (attempt 1)

Playwright Test Results (private-cloud - depot-ubuntu-latest-16)

 2 passed

Details

 2 tests across 2 suites
 42.2 seconds
 f622be2
 🔄 Run: #16544 (attempt 1)

[github-actions]

Visual Regression

16 screenshots compared. See report for details.
View full report