Expand provisioning steps for Packer build

example.json

@@ -16,7 +16,14 @@
   "provisioners": [{
     "type": "shell",
     "inline": [
-      "sudo apt-get update"
+      "sudo apt-get update",
+      "sudo apt-get install -y software-properties-common python-software-properties",
+      "sudo apt-add-repository -y ppa:openjdk-r/ppa",
+      "sudo apt-get update",
+      "sudo debconf-set-selections <<< \"jackd2 jackd/tweak_rt_limits boolean true\"",
+      "sudo DEBIAN_FRONTEND=noninteractive apt-get install -y alsa-utils jackd2 supercollider openjdk-8-jdk",
+      "sudo wget -nv -O /usr/local/bin/lein https://raw.githubusercontent.com/technomancy/leiningen/stable/bin/lein",
+      "sudo chmod a+x /usr/local/bin/lein"
     ]
   }]
 }