fix: strip trailing slash from GRAFANA_URL

[FSM1]

Summary

• Grafana dashboard provisioning failed with HTTP 301 because GRAFANA_URL had a trailing slash, causing a double-slash in the API path (https://host//api/dashboards/db)
• Adds GRAFANA_URL="${GRAFANA_URL%/}" to defensively strip trailing slashes
• Also updated the GRAFANA_URL GitHub variable to remove the trailing slash

Context

First run of the provision-dashboard job from PR #282 failed: https://github.com/FSM1/cipher-box/actions/runs/22799652757/job/66139917676

Test plan

• Merge and trigger a staging deploy — verify provision-dashboard job succeeds with HTTP 200

🤖 Generated with Claude Code

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📥 Commits

Reviewing files that changed from the base of the PR and between 362e2a9 and 0cbca00.

📒 Files selected for processing (1)

• .github/workflows/deploy-staging.yml

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch fix/grafana-trailing-slash

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