Use documentation formatter for rspec in devcontainer CI

[yahonda]

Summary

devcontainers/ci@v0.3 runs runCmd via docker exec -t, which gives the container a TTY. Ruby on a TTY sets STDOUT.sync = true, so rspec's progress formatter (which prints . per example with no newline) is flushed per character. The action's log capture treats each flush as a separate line, so a full spec run ends up with thousands of timestamped lines that each contain a single ANSI-wrapped dot (^[[32m.^[[0m repeated).

Pass SPEC_OPTS=\"--format documentation\" only for this workflow's rake spec invocation. The documentation formatter prints one full line per example (via puts, which includes a newline), so the action records one tidy log line per test instead of one per dot. Local .rspec is unchanged.

Mirrors rsim/oracle-enhanced#2802.

Why not change .rspec

.rspec is shared with local development and other workflows (test.yml, test_11g*.yml, test_gemfiles.yml, ruby_head.yml, jruby_head.yml, truffleruby.yml) which run rspec without the docker-exec TTY layer and where progress dots batch correctly. Limiting the override to the devcontainer workflow avoids changing what everyone else sees locally.

Test plan

• After merge, manually dispatch the devcontainer workflow and confirm the "Boot dev container and run tests" log shows one line per example (test name) instead of one line per dot.

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