fix(docker): retry apk add on transient Alpine mirror failures#185
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A flaky Alpine CDN made 'apk add python3 make g++' fail with exit 15, breaking a Railway deploy (and stranding an env-var change). Retry up to 5x with backoff so a transient mirror blip can't fail the build.
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A flaky Alpine package mirror made
apk add --no-cache python3 make g++fail with exit code 15, breaking a Railway deploy (which stranded aRESEND_FROM_EMAILenv change → all email stuck failing on the old build). Retries the apk step up to 5x with backoff so a transient CDN blip can't fail the build.Infra-only; no app code touched. Takes effect on the next build after merge+deploy. The immediate fix for the stuck deploy is a Railway Redeploy.