[SHOT-251] Update Dockerfile to use Ubuntu 22.04

[mimartin12]

🎟️ Tracking

https://bitwarden.atlassian.net/browse/SHOT-251

📔 Objective

Steps down the Ubuntu version due to FIPS issues.

📸 Screenshots

[github-actions]

🤖 Bitwarden Claude Code Review

Overall Assessment: APPROVE

This PR changes a single line in util/MsSql/Dockerfile, moving the base image from mcr.microsoft.com/mssql/server:2025-CU5-ubuntu-24.04 to the 2025-CU5-ubuntu-22.04 variant to address FIPS issues. The SQL Server version and cumulative update level are unchanged, so no data or schema compatibility impact is expected. The remaining Dockerfile steps (gosu/tzdata install, mssql-conf telemetry opt-out, /opt/mssql-tools18/bin/sqlcmd healthcheck) and the entrypoint.sh / backup-db.sh scripts contain no Ubuntu 24.04-specific dependencies. The image builds in CI, which will surface any tag or package availability problems.

Code Review Details

No findings.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 63.50%. Comparing base (0b43527) to head (c18f6ad).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #8183   +/-   ##
=======================================
  Coverage   63.50%   63.50%           
=======================================
  Files        2338     2338           
  Lines      101524   101524           
  Branches     9179     9179           
=======================================
+ Hits        64469    64470    +1     
+ Misses      34845    34844    -1     
  Partials     2210     2210           

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