Install openssl in cli container

[jlsherrill]

Using the container and building with a config.toml with a password will fail with:

Building manifest for bootc-based-qcow2
panic: user stage failed cannot generate password: exec: "openssl": executable file not found in $PATH, output:
	

goroutine 1 [running]:
github.com/osbuild/images/pkg/manifest.(*RawBootcImage).serialize(0xc0002466c0)
	/root/go/pkg/mod/github.com/osbuild/[email protected]/pkg/manifest/raw_bootc.go:206 +0x16dc
github.com/osbuild/images/pkg/manifest.Manifest.Serialize({{0xc000907400, 0x8, 0x8}, 0x5, {0x0, 0x0}}, 0xc00042ab40, 0xc00042aba0, 0xc0007d0780, 0xc000635448)
	/root/go/pkg/mod/github.com/osbuild/[email protected]/pkg/manifest/manifest.go:191 +0x3e5

[mvo5]

Very nice, thank you!

[bcl]

Ack