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Issue #, if available:
Description of changes:
Add packer variable file environment variables for users to specify the custom variable files for packer. Users now can only set variables dynamically by setting
PACKER_VARIABLES
. If users want to modify few more variables which are not listed intPACKER_VARIABLES
, then it would be helpful for them to define variables in json file and specify the file name toPACKER_VAR_FILE
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