chore(ci): add offline container deployment pipeline

server/Dockerfile

@@ -1,9 +1,11 @@
 # syntax=docker/dockerfile:1
 
 # ─── Stage 1: Build Go binaries ───────────────────────────────────────────────
-FROM golang:1.22-alpine AS builder
+FROM --platform=$BUILDPLATFORM golang:1.23-alpine AS builder
 
 ARG SERVICE=tenant-api
+ARG TARGETOS=linux
+ARG TARGETARCH=amd64
 
 RUN apk --no-cache add ca-certificates git
 
@@ -14,12 +16,12 @@ RUN go mod download
 
 COPY . .
 
-RUN CGO_ENABLED=0 GOOS=linux GOARCH=amd64 \
+RUN CGO_ENABLED=0 GOOS=${TARGETOS} GOARCH=${TARGETARCH} \
     go build -trimpath -ldflags="-s -w" \
     -o /bin/service ./cmd/${SERVICE}
 
 # ─── Stage 2: Migration image (bundles SQL files + migrate binary) ─────────────
-FROM migrate/migrate:v4.18.1 AS migrate-tool
+FROM migrate/migrate:v4.19.1 AS migrate-tool
 
 FROM alpine:3.19 AS migrate
 RUN apk --no-cache add ca-certificates