Added security scanning and mail delivery

.gitea/workflows/pip-audit.yaml

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+name: pip-audit
+on:
+  schedule:
+    - cron: "35 1 * * *"
+  push:
+    branches: [main]
+    paths: [requirements.txt, scripts/filter_requirements.py]
+  workflow_dispatch:
+
+jobs:
+  audit:
+    runs-on: ubuntu-latest
+    outputs:
+      report_b64: ${{ steps.audit.outputs.report_b64 }}
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: actions/setup-python@v5
+        with:
+          python-version: "3.12"
+
+      - name: Audit dependencies
+        id: audit
+        shell: bash
+        run: |
+          pip install pip-audit
+          python3 scripts/filter_requirements.py requirements.txt requirements.audit.txt
+
+          # Don't let a non-zero exit abort the step, so the report is saved first
+          set +e
+          pip-audit -r requirements.audit.txt --no-deps --disable-pip > audit.txt 2>&1
+          echo $? > audit.exit
+          set -e
+
+          cat audit.txt
+          echo "report_b64=$(head -c 100000 audit.txt | base64 -w0)" >> "$GITHUB_OUTPUT"
+
+      - name: Fail if the audit failed
+        shell: bash
+        run: exit "$(cat audit.exit)"
+
+  notify:
+    needs: audit
+    if: ${{ always() && needs.audit.result == 'failure' }}
+    runs-on: host
+    steps:
+      - name: Send mail via local postfix
+        env:
+          MAIL_FROM:  ${{ vars.MAIL_FROM }}
+          MAIL_TO:    ${{ vars.MAIL_TO }}
+          REPO:       ${{ gitea.repository }}
+          RUN_URL:    ${{ gitea.server_url }}/${{ gitea.repository }}/actions/runs/${{ gitea.run_number }}
+          REPORT_B64: ${{ needs.audit.outputs.report_b64 }}
+        run: |
+          python3 - <<'EOF'
+          import base64, os, smtplib
+          from email.message import EmailMessage
+
+          b64 = os.environ.get("REPORT_B64", "")
+          report = (
+              base64.b64decode(b64).decode("utf-8", errors="replace")
+              if b64 else
+              "(no audit output, the job failed before pip-audit finished)"
+          )
+
+          msg = EmailMessage()
+          msg["Subject"] = f"[pip-audit] Problem in {os.environ['REPO']}"
+          msg["From"] = os.environ["MAIL_FROM"]
+          msg["To"] = os.environ["MAIL_TO"]
+          msg.set_content(
+              f"pip-audit result for {os.environ['REPO']}:\n\n"
+              f"{report}\n\n"
+              f"Run: {os.environ['RUN_URL']}\n"
+          )
+
+          with smtplib.SMTP("127.0.0.1", 25, timeout=30) as s:
+              s.send_message(msg)
+          EOF

scripts/filter_requirements.py

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+#!/usr/bin/env python3
+"""Write a copy of requirements.txt without the self-hosted packages.
+
+Usage: filter_requirements.py <input> <output>
+"""
+import re
+import sys
+
+# Self-hosted packages that are not on PyPI. One per line.
+SKIP = {
+	"lib-db-module",
+	"lib-secret-manager",
+	"lib-send-notifications",
+	"simple-logger-handler",
+}
+
+NAME_RE = re.compile(r"^\s*([A-Za-z0-9][A-Za-z0-9._-]*)")
+
+
+def main(src: str, dst: str) -> None:
+	skipped = []
+
+	with open(src) as fin, open(dst, "w") as fout:
+		for line in fin:
+			match = NAME_RE.match(line)
+			if match and match.group(1) in SKIP:
+				skipped.append(match.group(1))
+				continue
+			fout.write(line)
+
+	print(f"Skipped {len(skipped)} self-hosted package(s): {', '.join(skipped) or '-'}")
+
+
+if __name__ == "__main__":
+	if len(sys.argv) != 3:
+		sys.exit(__doc__)
+	main(sys.argv[1], sys.argv[2])