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ci: harden GitHub Actions workflows - #55
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Declare `permissions: contents: read` at the workflow level so jobs that don't need more get a read-only token. Jobs that push, comment or publish keep their explicit job-level grants. The repository default is now read-only too, with Actions no longer allowed to approve pull requests.
tj-actions/changed-files was compromised in March 2025 (CVE-2025-30066) and runs on same-repo Renovate PRs, where the Docker Hub token is available. A plain `git diff` against the merge commit's base parent does the same job without a third-party action.
Every job now has a timeout-minutes sized from observed run times (CI jobs 5-15 min, image builds 30-90 min, deploys 20 min) instead of the 6-hour default. Pull request workflows cancel the previous run of the same PR when a new commit is pushed; runs on push are never cancelled.
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GitHub Actions hardening from a workflow audit across the SILARHI / personal repositories. One commit per change:
permissions:block now getcontents: read; jobs that push, comment or publish keep their explicit job-level grants. The repository default token is also read-only now, and Actions can no longer approve pull requests (already applied in the repo settings).tj-actions/changed-files(compromised in March 2025, CVE-2025-30066) is replaced by a plaingit diff HEAD^1 HEADagainst the PR merge commit.timeout-minutessized from observed run times (CI 5-15 min, image builds 30-90 min, deploys 20 min) instead of the 6-hour default, and pull request workflows cancel the previous run of the same PR (push runs are never cancelled).