Replace cfssl/cfssljson with step cli from smallstep/cli

[Copilot]

Migrates all certificate generation tooling from CloudFlare's cfssl to smallstep's step cli.

Changes

• hack/lib/util.sh:

  • kube::util::ensure-cfssl → kube::util::ensure-step (downloads step v0.29.0, supports linux/darwin amd64/arm64)
  • kube::util::create_client_certkey and kube::util::create_serving_certkey now use step certificate create

• cluster/common.sh: Rewrote generate-etcd-cert to use step cli for CA, client, server, and peer certs

• cluster/gce/util.sh: Updated all inline cfssl calls to use step cli

• testdata/generate.sh scripts: Updated 4 scripts to use step cli commands

Command Mapping

# Before (cfssl)
cfssl gencert -initca csr.json | cfssljson -bare ca
cfssl gencert -ca ca.pem -ca-key ca-key.pem ... | cfssljson -bare name

# After (step)
step certificate create "CN" ca.pem ca-key.pem --profile root-ca --no-password --insecure
step certificate create "CN" name.pem name-key.pem --ca ca.pem --ca-key ca-key.pem --no-password --insecure

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• dl.smallstep.com
  • Triggering command: /usr/bin/curl curl -sL REDACTED -o step.tar.gz (dns block)
  • Triggering command: /usr/bin/curl curl -v REDACTED (dns block)
• https://api.github.com/repos/smallstep/cli/releases/latest
  • Triggering command: /home/REDACTED/work/_temp/ghcca-node/node/bin/node /home/REDACTED/work/_temp/ghcca-node/node/bin/node --enable-source-maps /home/REDACTED/work/_temp/copilot-developer-action-main/dist/index.js (http block)
• smallstep.com
  • Triggering command: /home/REDACTED/work/_temp/ghcca-node/node/bin/node /home/REDACTED/work/_temp/ghcca-node/node/bin/node --enable-source-maps /home/REDACTED/work/_temp/copilot-developer-action-main/dist/index.js (dns block)
  • Triggering command: /usr/bin/curl curl -sL REDACTED (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)

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💡 You can make Copilot smarter by setting up custom instructions, customizing its development environment and configuring Model Context Protocol (MCP) servers. Learn more Copilot coding agent tips in the docs.