parameterized components for perl6-bench (draft)

gistfile1.json

[
 "I would expect the components to be addressable as",
 "- nqp-moarvm/1234:fabcd     -  commit 1234 of nqp, fabcd of moarvm",
 "- nqp-moarvm/1234           -  commit 1234 of nqp, MOARVM_REVISION of moarvm, since --gen-moar gets no argument",
 "- rakudo-moar/f00b42::fabcd -  commit f00b42 of rakudo, NQP_REVISION of nqp and fabcd of moarvm",
 "- rakudo-moar/f00b42:1234   -  commit f00b42 of rakudo, 1234 of nqp and MOAR_REVISION of moarvm"
]

{
    "nqp-moarvm": {
        "name":         "nqp-moarvm",
        "repo_url":     "git://github.com/perl6/nqp.git",
        "parameters":   [ "mvm" ],
        "release_tags": "^ 20\\d\\d \\D \\d\\d [\\.\\d+]? $",
        "build_steps":  [
            [ "make", "realclean" ],
            [ "rm", "-rf", "install", "moarvm" ],
            [ "git", "clone", "-l", "../../moarvm/moarvm.git" ],
            [ "perl", "Configure.pl", "--backends=moar", { "mvm": "--gen-moar=$mvm", "": "--gen-moar" } ],
            [ "make" ],
            [ "make", "install" ]
        ]
    },

    "rakudo-moar": {
        "name":         "rakudo-moar",
        "repo_url":     "git://github.com/rakudo/rakudo.git",
        "release_tags": "^ 20\\d\\d \\D \\d\\d [\\.\\d+]? $",
        "parameters":   [ "nqp", "mvm" ],
        "build_steps":  [
            [ "make", "realclean" ],
            [ "git", "clean", "-dxf" ],
            [ "rm", "-rf", "install", "nqp", "moarvm" ],
            [ "git", "clone", "-l", "../../moarvm/moarvm.git" ],
            [ "git", "clone", "-l", "../../nqp-moarvm/nqp-moarvm.git", "nqp" ],
            [ "perl", "Configure.pl", "--backends=moar",
                    { "mvm": "--gen-moar=$mvm", "": "--gen-moar" }, 
                    { "nqp": "--gen-nqp=$nqp", }, // implicit "":""
                    ],
            [ "make" ],
            [ "make", "install" ]
        ]
    },
}