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spot_instance_types (array of strings) - a list of acceptable instance
types to run your build on. We will request a spot instance using the max
price of spot_price and the allocation strategy of "lowest price".
Your instance will be launched on an instance type of the lowest available
price that you have in your list. This is used in place of instance_type.
You may only set either spot_instance_types or instance_type, not both.
This feature exists to help prevent situations where a Packer build fails
because a particular availability zone does not have capacity for the
specific instance_type requested in instance_type.
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spot_price (string) - The maximum hourly price to pay for a spot instance
to create the AMI. Spot instances are a type of instance that EC2 starts
when the current spot price is less than the maximum price you specify.
Spot price will be updated based on available spot instance capacity and
current spot instance requests. It may save you some costs. You can set
this to auto for Packer to automatically discover the best spot price or
to "0" to use an on demand instance (default).
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spot_price_auto_product (string) - Required if spot_price is set to
auto. This tells Packer what sort of AMI you're launching to find the
best spot price. This must be one of: Linux/UNIX, SUSE Linux,
Windows, Linux/UNIX (Amazon VPC), SUSE Linux (Amazon VPC),
Windows (Amazon VPC)
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spot_tags (object of key/value strings) - Requires spot_price to be
set. This tells Packer to apply tags to the spot request that is issued.