root: use hashes for dockerfile FROM (cherry-pick #17795 to version-2025.10)

[authentik-automation]

⚠️ This cherry-pick has conflicts that require manual resolution.

Cherry-pick of #17795 to version-2025.10 branch.

Original PR: #17795
Original Author: @BeryJu
Cherry-picked commit: 6f35c32

Please resolve the conflicts in this PR before merging.

[netlify]

✅ Deploy Preview for authentik-docs ready!

Name	Link
🔨 Latest commit	640349b
🔍 Latest deploy log	https://app.netlify.com/projects/authentik-docs/deploys/690206de0c54360009dfaf8b
😎 Deploy Preview	https://deploy-preview-17798--authentik-docs.netlify.app
📱 Preview on mobile	Toggle QR Code... Use your smartphone camera to open QR code link.

---

To edit notification comments on pull requests, go to your Netlify project configuration.

[netlify]

✅ Deploy Preview for authentik-integrations ready!

Name	Link
🔨 Latest commit	640349b
🔍 Latest deploy log	https://app.netlify.com/projects/authentik-integrations/deploys/690206ddc6ad6c0008f5bc52
😎 Deploy Preview	https://deploy-preview-17798--authentik-integrations.netlify.app
📱 Preview on mobile	Toggle QR Code... Use your smartphone camera to open QR code link.

---

To edit notification comments on pull requests, go to your Netlify project configuration.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 92.94%. Comparing base (5816f0d) to head (640349b).
⚠️ Report is 1 commits behind head on version-2025.10.
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@                 Coverage Diff                 @@
##           version-2025.10   #17798      +/-   ##
===================================================
- Coverage            92.98%   92.94%   -0.05%     
===================================================
  Files                  869      869              
  Lines                47947    47947              
===================================================
- Hits                 44584    44563      -21     
- Misses                3363     3384      +21     

Flag	Coverage Δ
e2e	45.19% <ø> (-0.09%)	⬇️
integration	23.19% <ø> (+<0.01%)	⬆️
unit	91.08% <ø> (+<0.01%)	⬆️
unit-migrate	91.13% <ø> (+<0.01%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.