Azure: installing zip to use tfenv

[dieutoutpuissant]

Using ekino/ci-azure:2-2024.10.31:

$ tfenv install
Installing Terraform v1.9.8
Downloading release tarball from https://releases.hashicorp.com/terraform/1.9.8/terraform_1.9.8_linux_amd64.zip
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Downloading SHA hash file from https://releases.hashicorp.com/terraform/1.9.8/terraform_1.9.8_SHA256SUMS
Not instructed to use Local PGP (/root/.tfenv/use-{gpgv,gnupg}) & No keybase install found, skipping OpenPGP signature verification
/root/.tfenv/libexec/tfenv-install: line 297: unzip: command not found
Tarball unzip failed