feat(phase-2): add jq and yq to rc docker image

[overtrue]

Summary

• install jq and yq in the runtime stage of the Docker image
• add a regression test to enforce jq/yq presence in the runtime apk add line

Issue

Closes #43

Root Cause

The runtime image only installed ca-certificates, so jq and yq were unavailable in rustfs/rc:latest containers.

Verification

Reproduction (before fix, published latest image)

docker run --rm --entrypoint sh rustfs/rc:latest -lc 'command -v jq >/dev/null 2>&1 || echo jq-missing; command -v yq >/dev/null 2>&1 || echo yq-missing'

Observed:

• jq-missing
• yq-missing

After fix (branch image)

docker build -t rustfs-rc:issue-43 .
docker run --rm --entrypoint sh rustfs-rc:issue-43 -lc 'jq --version && yq --version'

Observed:

• jq-1.8.1
• yq ... v4.49.2

Quality gates

• cargo fmt --all
• cargo clippy --workspace -- -D warnings
• cargo test --workspace

All passed.

Additional scan for similar issues

Searched for other runtime package install points and related Docker image definitions; no additional missing jq/yq installation locations were found.

[Copilot]

Pull request overview

Adds commonly requested JSON/YAML tooling to the rustfs/rc runtime container image and introduces a contract test to prevent those tools from being removed unintentionally in future Dockerfile edits (closes #43).

Changes:

• Install jq and yq in the Docker runtime stage via apk add.
• Add a CLI integration test that inspects the root Dockerfile to enforce presence of jq/yq in the runtime package install.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

File	Description
Dockerfile	Adds jq and yq to the runtime-stage apk add invocation.
crates/cli/tests/dockerfile_runtime_tools.rs	Adds a contract test to detect regressions in runtime-tool availability.

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