Fix air routes sample permission error on Podman

[kmcginnes]

Description

Fix the air routes Gremlin Server sample failing on Podman (and other rootless container runtimes) with a sed: Permission denied error.

The default entrypoint runs sed -i on the config file to replace the host binding, which fails when the container user cannot write to the bind-mounted volume. This bypasses the entrypoint by setting host: database directly in the config and launching gremlin-server.sh without the sed hack.

• Set host: database in the Gremlin Server config so the sed substitution is unnecessary
• Override the entrypoint to call gremlin-server.sh directly
• Mount the sample volume as read-only since nothing needs to write to it

Validation

• Tested with Podman — container starts successfully without permission errors

Check List

• I confirm that my contribution is made under the terms of the Apache 2.0 license.
• I have run pnpm checks to ensure code compiles and meets standards.
• I have run pnpm test to check if all tests are passing.
• I have covered new added functionality with unit tests if necessary.
• I have added an entry in the Changelog.md.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 64.91%. Comparing base (c5affc5) to head (5cb93ae).
⚠️ Report is 99 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff             @@
##             main    #1588       +/-   ##
===========================================
+ Coverage   47.81%   64.91%   +17.10%     
===========================================
  Files         382      372       -10     
  Lines        8525     8382      -143     
  Branches     3159     3123       -36     
===========================================
+ Hits         4076     5441     +1365     
+ Misses       3070     2086      -984     
+ Partials     1379      855      -524     

Flag	Coverage Δ
unittests	64.91% <ø> (+17.10%)	⬆️

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