[GR-46527] Specify to only build the TruffleRuby installable

* This saves disk space by avoiding to create other installables such as
  the LLVM toolchain installable.

Author: eregon

mx.truffleruby/native

@@ -3,4 +3,4 @@ DYNAMIC_IMPORTS=/tools,/compiler,/substratevm
 COMPONENTS=TruffleRuby,suite:tools,GraalVM compiler,SubstrateVM,Native Image
 NATIVE_IMAGES=suite:sulong,lib:rubyvm
 # To also create the standalone
-DISABLE_INSTALLABLES=false
+INSTALLABLES=TruffleRuby

mx.truffleruby/native-ee

@@ -4,4 +4,4 @@ COMPONENTS=TruffleRuby,suite:tools,GraalVM enterprise compiler,SubstrateVM Enter
 NATIVE_IMAGES=suite:sulong,lib:rubyvm
 EXTRA_IMAGE_BUILDER_ARGUMENTS=rubyvm:-H:+AuxiliaryEngineCache rubyvm:-H:ReservedAuxiliaryImageBytes=1073741824
 # To also create the standalone
-DISABLE_INSTALLABLES=false
+INSTALLABLES=TruffleRuby

mx.truffleruby/native-ee-g1

@@ -4,4 +4,4 @@ COMPONENTS=TruffleRuby,suite:tools,GraalVM enterprise compiler,SubstrateVM Enter
 NATIVE_IMAGES=suite:sulong,lib:rubyvm
 EXTRA_IMAGE_BUILDER_ARGUMENTS=rubyvm:-H:+UseG1GC
 # To also create the standalone
-DISABLE_INSTALLABLES=false
+INSTALLABLES=TruffleRuby

mx.truffleruby/native-host-inlining

@@ -4,4 +4,4 @@ COMPONENTS=TruffleRuby,suite:tools,GraalVM compiler,SubstrateVM,Native Image
 NATIVE_IMAGES=lib:rubyvm
 EXTRA_IMAGE_BUILDER_ARGUMENTS=rubyvm:-H:Log=HostInliningPhase,~CanonicalizerPhase,~GraphBuilderPhase rubyvm:-H:+TruffleHostInliningPrintExplored rubyvm:-Dgraal.LogFile=host-inlining.txt
 # To also create the standalone
-DISABLE_INSTALLABLES=false
+INSTALLABLES=TruffleRuby