feat(go-api): multi-stage Dockerfile for Go API service#33
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Multi-stage build: golang:1.22-alpine builder downloads modules then compiles with CGO_ENABLED=0 for a fully static binary; alpine:3.19 runtime copies only the binary and runs as non-root trident user on port 3000. Extends CI with a docker-build job that builds the Go API image using GitHub Actions cache.
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Summary
Dockerfileatservices/api/Dockerfile:golang:1.22-alpinebuilder (module cache layer + CGO_ENABLED=0 static build) +alpine:3.19runtimetridentuser, exposes port 3000docker-buildCI job to buildtrident-go-api:ciwith GHA cacheTest plan
docker build -f services/api/Dockerfile .succeeds locallydocker-buildjob passes on this PRCloses #17