Defect: sztabina fails to build on Apple Silicon (arm64)

Release: 1.8
Severity: Blocker
Component: sztabina / Docker
Reported by: Wojciech Kapcia
Reproducible: Yes
Linked defect: Backend Flyway migration syntax error (Rel 1.8)

Environment

• Host: macOS (MBP M1 / arm64)
• Command:

cd deploy/docker
docker compose up --build

Observed Error

runtime: lfstack.push invalid packing

Occurs during Docker build step:

RUN CGO_ENABLED=0 GOOS=linux GOARCH=amd64 go build -o sztabina .

Root Cause

The sztabina Dockerfile hardcodes GOARCH=amd64, forcing cross-compilation on an arm64 host.
This triggers a Go runtime failure when building pure-Go binaries on Apple Silicon.

Expected Behavior

sztabina should build successfully on both:

• linux/amd64
• linux/arm64

without requiring manual architecture overrides.

Proposed Fix

Use Docker BuildKit architecture variables instead of hardcoding the target architecture:

ARG TARGETOS
ARG TARGETARCH

RUN CGO_ENABLED=0 \
    GOOS=${TARGETOS} \
    GOARCH=${TARGETARCH} \
    go build -o sztabina .

This allows Docker to select the correct architecture automatically.

Impact

• docker compose up --build fails on Apple Silicon
• Blocks local development on modern Macs
• Prevents evaluation of Rel 1.8 on arm64 hosts

Notes

• Deterministic and reproducible
• No behavior change expected for x86 users
• Fix aligns with Docker BuildKit best practices