name: Trivy Scheduled Scan

# Two scans that the per-change gates cannot do, on a daily cadence.
#
# What already exists and is NOT repeated here:
#   - `security.yml` → `dependency-audit` runs `pnpm audit --prod` on every
#     push to `main` and once a day, blocking on HIGH/CRITICAL.
#   - `security.yml` → `docker-security` builds the image on a push to `main`
#     and runs `trivy image` against it, blocking on HIGH/CRITICAL.
#
# Both are change-triggered, and both answer "is this change safe". Neither
# answers "is what we shipped last week still safe", because an advisory
# published today lands against an image nobody is about to rebuild. That is
# what the schedule is for. There is deliberately no push or pull_request
# trigger: adding one would run the same scan the `docker-security` job
# already ran, minutes later, on the same tree.
on:
  schedule:
    # Daily, 05:17 UTC.
    - cron: "17 5 * * *"
  workflow_dispatch:

permissions:
  contents: read

concurrency:
  group: trivy-scheduled
  cancel-in-progress: true

jobs:
  filesystem:
    name: Lockfile (including dev dependencies)
    runs-on: ubuntu-24.04
    timeout-minutes: 20
    permissions:
      contents: read
      security-events: write

    steps:
      - name: Checkout
        uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1

      # `pnpm audit --prod` is the blocking gate and it is scoped to
      # production dependencies on purpose: a dev-only advisory should not
      # stop a release. The gap that scoping leaves is that "dev dependency"
      # and "not in the image" are not the same statement.
      #
      # `pdfjs-dist` is the worked example. It sits in `devDependencies`,
      # and `src/lib/documents/rasterize-pdf.ts` imports it at runtime, so
      # Next's standalone output tracing copies it into the production
      # image. `pnpm audit --prod` cannot see it. This scan can: without
      # the flag Trivy reads 627 packages out of `pnpm-lock.yaml`, with it
      # 1455, and `pdfjs-dist` is only in the second set.
      #
      # Trivy's own `--help` lists the flag as supported for npm, yarn and
      # gradle. It works on `pnpm-lock.yaml` too; the help text is behind
      # the parser. Verified against this repository before this workflow
      # was written, and worth re-checking if the package count ever
      # collapses back to the production figure.
      #
      # Report-only, and that is a deliberate choice rather than a soft
      # one. The findings this widening surfaces are overwhelmingly
      # transitive dev-tool advisories with fixes available upstream;
      # failing the run on them from day one produces a red badge that gets
      # muted within a week, and a muted signal is worse than none. The
      # SARIF upload puts every finding in the repository's code-scanning
      # alerts, which persist, notify, and can be triaged one at a time.
      # The blocking answer to "does this ship" stays where it is, in
      # `security.yml`.
      - name: Trivy filesystem scan
        uses: aquasecurity/trivy-action@ed142fd0673e97e23eac54620cfb913e5ce36c25 # v0.36.0
        env:
          # No action input maps to `--include-dev-deps`; Trivy reads every
          # flag from a `TRIVY_`-prefixed environment variable, so this is
          # the documented way to reach it through the action.
          TRIVY_INCLUDE_DEV_DEPS: "true"
        with:
          scan-type: fs
          scan-ref: .
          scanners: vuln
          format: sarif
          output: trivy-filesystem.sarif
          severity: "CRITICAL,HIGH,MEDIUM"
          limit-severities-for-sarif: true
          exit-code: "0"
          # Generated Prisma client. Nobody edits it, the fix for anything
          # found in it is `pnpm prisma generate`, and it is ~9 MB.
          skip-dirs: src/generated

      - name: Upload results
        uses: github/codeql-action/upload-sarif@9b3254085494b55a0f7c4c2b3d2d52cc712ce370 # v4.39.1
        with:
          sarif_file: trivy-filesystem.sarif
          category: trivy-filesystem

  published-image:
    name: Published image
    runs-on: ubuntu-24.04
    timeout-minutes: 20
    permissions:
      contents: read
      packages: read
      security-events: write

    steps:
      # The `docker-security` job scans an image it just built from the
      # current `main`. This one scans the image operators actually pull,
      # which is the one built from the last release tag and unchanged
      # since. The two answer different questions and the gap between them
      # widens every day a release stays out.
      #
      # Trivy resolves the multi-arch manifest to the runner's platform, so
      # this covers `linux/amd64`. The arm64 manifest shares every
      # application layer and differs only in native binaries.
      - name: Log in to GitHub Container Registry
        uses: docker/login-action@81c6f93d4bc991e510b342a00b419b3bb4efc5c6 # v4.7.0
        with:
          registry: ghcr.io
          username: ${{ github.actor }}
          password: ${{ secrets.GITHUB_TOKEN }}

      # `.trivyignore` lives at the repository root and Trivy reads it
      # automatically, so the suppressions the blocking gate already
      # carries apply here too and the two scans cannot disagree about
      # what is accepted.
      - name: Checkout for .trivyignore
        uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1

      # Fails on CRITICAL only. A critical advisory against the image
      # self-hosters are running right now is worth a red badge and a
      # notification; HIGH goes to code scanning with everything else,
      # because the release pipeline already refuses to publish an image
      # carrying one and anything that appears here appeared after the
      # fact.
      - name: Trivy published-image scan
        uses: aquasecurity/trivy-action@ed142fd0673e97e23eac54620cfb913e5ce36c25 # v0.36.0
        with:
          scan-type: image
          image-ref: ghcr.io/mbombeck/healthlog:latest
          scanners: vuln
          format: sarif
          output: trivy-published-image.sarif
          severity: "CRITICAL,HIGH,MEDIUM"
          limit-severities-for-sarif: true
          exit-code: "0"

      - name: Upload results
        uses: github/codeql-action/upload-sarif@9b3254085494b55a0f7c4c2b3d2d52cc712ce370 # v4.39.1
        with:
          sarif_file: trivy-published-image.sarif
          category: trivy-published-image

      # Separate table pass so the SARIF upload above always runs, even
      # when this one fails the job. A scan whose failure suppresses its
      # own report is a scan you have to re-run by hand to read.
      - name: Fail on a critical finding in the published image
        uses: aquasecurity/trivy-action@ed142fd0673e97e23eac54620cfb913e5ce36c25 # v0.36.0
        with:
          scan-type: image
          image-ref: ghcr.io/mbombeck/healthlog:latest
          scanners: vuln
          format: table
          severity: "CRITICAL"
          exit-code: "1"