feat: use kubernetes lease election for Trillian log signer #851

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Status	Duration	Name
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✅ Succeeded	21 seconds	prefetch-dependencies
✅ Succeeded	52 seconds	build-container
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✅ Succeeded	41 seconds	build-source-image
✅ Succeeded	44 seconds	push-dockerfile
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✅ Succeeded	58 seconds	rpms-signature-scan
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✅ Succeeded	57 seconds	sast-unicode-check
✅ Succeeded	1 minute	sast-snyk-check
✅ Succeeded	36 seconds	ecosystem-cert-preflight-checks
✅ Succeeded	29 seconds	clair-scan
✅ Succeeded	9 seconds	show-sbom