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docs(compose): single-definition image ref via extension field + anchor #68

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docs(compose): single-definition image ref via extension field + anchor #68

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1 change: 1 addition & 0 deletions skills/docker-development/SKILL.md
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Expand Up @@ -126,6 +126,7 @@ Exclude: `.git`, `node_modules`/`vendor`, `.env*`, `*.pem`, `*.key`
- startup ordering: `depends_on.condition: service_healthy` + `healthcheck` `start_period`
- `networks.internal: true` isolates databases
- `profiles: [debug]`: start only with `--profile debug`
- shared image ref: define ONCE per file as top-level extension field + anchor -- `x-app-image: &app-image registry/app:${APP_IMAGE_VERSION:-85}`, services use `image: *app-image`. `:-` defaults cover unset AND empty vars (a bare omitted tag silently resolves `:latest`). Anchors are file-local: every overlay file needs its own. Verify both paths: `APP_IMAGE_VERSION= docker compose config` and with an override

## References

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