build(docker): add multi-stage distroless image and ci verification - #143
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June 16, 2026 09:03
Add a root Dockerfile with a temurin 21 builder stage that produces the ledger bootJar and a gcr.io/distroless/java21-debian12:nonroot runtime stage carrying only the jar, running rootless on port 8080. Add a docker ci job that builds the image and asserts the two named stages, the nonroot user, an under-300mb size, a runnable smoke (spring boot starts under java 21), and a trivy image scan with no critical findings. The existing build-test and security jobs are unchanged. Closes #63
The new distroless image trivy gate found 4 critical cves in the boot 3.5.2 dependency tree: tomcat-embed-core 10.1.42 (CVE-2026-41293, CVE-2026-43512, CVE-2026-43515) and spring-security-web 6.5.1 (CVE-2026-22732). Boot 3.5.15 brings tomcat 10.1.55 and spring-security 6.5.11, clearing all four. Local test/detekt/spotless green.
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What
First slice of the E-01 ops cluster. Adds a container image for the ledger service.
Dockerfile, two named stages:builder(eclipse-temurin:21-jdk, builds the bootJar via the gradle wrapper, tests excluded - ITs need Postgres and run inbuild-test) andruntime(gcr.io/distroless/java21-debian12:nonroot, carries only the jar, rootless,EXPOSE 8080,ENTRYPOINT ["java","-jar","/app/app.jar"]).find ... ! -name '*-plain.jar'so the Spring Boot plain jar never collides with the executable jar.dockerCI job (needsbuild-test): builds the image and verifies every AC - two stages + distroless base, nonroot user (docker inspect), size < 300 MB, a runnable smoke (Starting LedgerApplicationunder java 21, full boot deferred to docker-compose ledger smoke test (healthy < 30s) #66 compose), and a Trivy image scan for CRITICAL (ECR DB mirror, no push).Notes
build-testandlint-security(filesystem Trivy + sarif guard) are untouched.Gate chain: analyst spec, architect plan, critic GO-WITH-CHANGES (3 changes folded in: fail-on-grep-miss smoke, plain-jar-independent copy, explicit Trivy ECR env).
Closes #63