feat(docker): Alpine - migrate to 3.15 (3.14 was removed)

[ovr]

Hello!

https://github.com/cube-js/cube.js/actions/runs/3890140417/jobs/6639503153

There are no new docker images for Node.js and Alpine 3.14. Let's migrate to 3.15 (as nearest version).

Thanks

[codecov]

Codecov Report

Base: 82.52% // Head: 41.40% // Decreases project coverage by -41.12% ⚠️

Coverage data is based on head (eb5458c) compared to base (2b15f0c).
Patch has no changes to coverable lines.

Additional details and impacted files

@@             Coverage Diff             @@
##           master    #5997       +/-   ##
===========================================
- Coverage   82.52%   41.40%   -41.13%     
===========================================
  Files         139      150       +11     
  Lines       19745    19780       +35     
  Branches        0     5150     +5150     
===========================================
- Hits        16295     8190     -8105     
- Misses       3450    10774     +7324     
- Partials        0      816      +816     

Flag	Coverage Δ
cube-backend	41.40% <ø> (?)
cubesql	?

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

Impacted Files	Coverage Δ
rust/cubesql/cubesql/src/compile/engine/df/scan.rs
...t/cubesql/cubesql/src/compile/rewrite/rules/mod.rs
...engine/information_schema/postgres/pg_namespace.rs
.../cubesql/cubeclient/src/models/v1_meta_response.rs
.../cubesql/cubesql/src/compile/rewrite/rules/case.rs
...e/information_schema/postgres/role_table_grants.rs
rust/cubesql/pg-srv/src/buffer.rs
rust/cubesql/pg-srv/src/protocol.rs
rust/cubesql/cubesql/src/sql/session_manager.rs
...nformation_schema/redshift/svv_external_schemas.rs
... and 279 more

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