update userdata install commands

Author: wleepang

templates/cloud-init-userdata.yaml

@@ -8,9 +8,12 @@ packages:
   - python27-pip
   - sed
   - wget
+  - git
 
 
 runcmd:
   - pip install -U awscli boto3
-  - cd /opt && wget https://aws-genomics-workflows.s3.amazonaws.com/artifacts/aws-ebs-autoscale.tgz && tar -xzf aws-ebs-autoscale.tgz
-  - sh /opt/ebs-autoscale/install.sh /scratch 2>&1 > /var/log/intall-ebs-autoscale.log
+  - EBS_AUTOSCALE_VERSION=$(curl --silent "https://api.github.com/repos/awslabs/amazon-ebs-autoscale/releases/latest" | jq -r .tag_name)
+  - cd /opt && git clone https://github.com/awslabs/amazon-ebs-autoscale.git
+  - cd /opt/amazon-ebs-autoscale && git checkout $EBS_AUTOSCALE_VERSION
+  - sh /opt/amazon-ebs-autoscale/install.sh $scratchPath /dev/sdc 2>&1 > /var/log/ebs-autoscale-install.log