Error when trying to run npm build on gitlab-ci with terraform - amazon-s3

Question

I'm new to terraform but I've been fairly successful so far. I'm trying to get a mithril app to be built and deployed fully with terraform and gitlab to aws s3 and cloudfront. It is failing on this block here:
data "external" "frontend_build" {
program = ["bash", "-c",
<<EOT
(npm ci && npm run build -- --env.PARAM="$(jq -r '.param')") >&2 && echo "{\"dest\": \"dist\"}"
EOT
]
working_dir = "${path.module}/frontend"
query = {
param = "Hi from Terraform!"
}
}
Here is the error message from gitlab:
Error: External Program Lookup Failed
│
│ with data.external.frontend_build,
│ on data.tf line 2, in data "external" "frontend_build":
│ 2: program = ["bash", "-c", <<EOT
│ 3: (npm ci && npm run build -- --env.PARAM="$(jq -r '.param')") >&2 && echo "{\"dest\": \"dist\"}"
│ 4: EOT
│ 5: ]
│
│ The data source received an unexpected error while attempting to find the
│ program.
│
│ The program must be accessible according to the platform where Terraform is
│ running.
│
│ If the expected program should be automatically found on the platform where
│ Terraform is running, ensure that the program is in an expected directory.
│ On Unix-based platforms, these directories are typically searched based on
│ the '$PATH' environment variable. On Windows-based platforms, these
│ directories are typically searched based on the '%PATH%' environment
│ variable.
│
│ If the expected program is relative to the Terraform configuration, it is
│ recommended that the program name includes the interpolated value of
│ 'path.module' before the program name to ensure that it is compatible with
│ varying module usage. For example: "${path.module}/my-program"
│
│ The program must also be executable according to the platform where
│ Terraform is running. On Unix-based platforms, the file on the filesystem
│ must have the executable bit set. On Windows-based platforms, no action is
│ typically necessary.
│
│ Platform: linux
│ Program: bash
│ Error: exec: "bash": executable file not found in $PATH
I got this code from a tutorial so it may be outdated, but I can't find anyone else talking about this particular thing.
EDIT:
Here is my .gitlab-ci.yml
include:
- template: Terraform.latest.gitlab-ci.yml
variables:
TF_STATE_NAME: default
TF_CACHE_KEY: default
TF_ROOT: terraform/