Make checkrr architecture tag configurable via CHECKRR_IMAGE_TAG

[joshdev8]

Context

Follow-up to a CodeRabbit nitpick on #44: checkrr's tag was hard-coded to latest-amd64 (checkrr publishes no multi-arch image), so arm64 users had to edit the tracked docker-compose.yml before docker compose up -d would work.

Change

Make the tag an env override with the amd64 tag as the default:

image: ghcr.io/aetaric/checkrr:${CHECKRR_IMAGE_TAG:-latest-amd64}

This matches the ${VAR:-default} pattern already used for GRAFANA_PORT and LOCAL_NETWORK. Added CHECKRR_IMAGE_TAG=latest-amd64 to .env.example with a note that arm64 hosts set it to latest-arm64v8. Default behavior is unchanged — amd64 users need to do nothing.

Testing

docker compose config --images verified in three cases:

• default (.env.example value) → latest-amd64
• CHECKRR_IMAGE_TAG=latest-arm64v8 → latest-arm64v8
• var removed entirely → falls back to latest-amd64

🤖 Generated with Claude Code

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Review details

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: d39206df-8e74-44b0-8a34-531c6a771922

📥 Commits

Reviewing files that changed from the base of the PR and between b878018 and 18e356b.

📒 Files selected for processing (2)

• .env.example
• docker-compose.yml

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/checkrr-configurable-tag

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