Coder Terraform Provider: add post-release CI step to update module versions

[johnstcn]

Problem

coder/coder has a number of test fixtures, examples, and other Terraform files that reference the coder/coder Terrafomr provider. Some of them fix the version, and some do not.
After releasing an updated version of coder/terraform-provider-coder, these versions may become out of date.

$ rg -t tf 'source\s+=\s+"coder/coder"' | awk -F ':' '{print $1}' | xargs -l dirname | sort | uniq
# Note: it would actually be amazing to be able to keep this on the latest 'main', but we would
# need to push a pre-release version on every commit.
dogfood/contents
dogfood/contents/zed
envbuilder-dogfood
# Note: the examples directory may not be as important but keeping it in scope for now
examples/jfrog/docker
examples/parameters
examples/parameters-dynamic-options
examples/templates/aws-devcontainer
examples/templates/aws-linux
examples/templates/aws-windows
examples/templates/azure-linux
examples/templates/azure-windows
examples/templates/digitalocean-linux
examples/templates/docker
examples/templates/docker-devcontainer
examples/templates/gcp-devcontainer
examples/templates/gcp-linux
examples/templates/gcp-vm-container
examples/templates/gcp-windows
examples/templates/incus
examples/templates/kubernetes
examples/templates/kubernetes-devcontainer
examples/templates/kubernetes-envbox
examples/templates/nomad-docker
examples/templates/scratch
examples/workspace-tags
provisioner/terraform/testdata/calling-module
provisioner/terraform/testdata/chaining-resources
provisioner/terraform/testdata/conflicting-resources
provisioner/terraform/testdata/display-apps
provisioner/terraform/testdata/display-apps-disabled
provisioner/terraform/testdata/external-auth-providers
provisioner/terraform/testdata/instance-id
provisioner/terraform/testdata/kubernetes-metadata
provisioner/terraform/testdata/mapped-apps
provisioner/terraform/testdata/multiple-agents
provisioner/terraform/testdata/multiple-agents-multiple-apps
provisioner/terraform/testdata/multiple-agents-multiple-envs
provisioner/terraform/testdata/multiple-agents-multiple-monitors
provisioner/terraform/testdata/multiple-agents-multiple-scripts
provisioner/terraform/testdata/multiple-apps
provisioner/terraform/testdata/presets
provisioner/terraform/testdata/presets/external-module
provisioner/terraform/testdata/presets/external-module/child-external-module
provisioner/terraform/testdata/resource-metadata
provisioner/terraform/testdata/resource-metadata-duplicate
provisioner/terraform/testdata/rich-parameters
provisioner/terraform/testdata/rich-parameters/external-module
provisioner/terraform/testdata/rich-parameters/external-module/child-external-module
provisioner/terraform/testdata/rich-parameters-order
provisioner/terraform/testdata/rich-parameters-validation
scaletest/templates/kubernetes-large
scaletest/templates/kubernetes-medium
scaletest/templates/kubernetes-medium-greedy
scaletest/templates/kubernetes-minimal
scaletest/templates/kubernetes-small
scaletest/templates/scaletest-runner
scaletest/terraform/action
scaletest/terraform/k8s

Not fixing the provider version may cause unintended changes and flakes.

Proposed Solution

1. Create a script that will update all references to the coder/coder provider to a specified version. It should probably also run make gen etc.
2. Add a post-release CI step in coder/terraform-provider-coder to clone coder/coder, run the above script, and submit a PR.
3. ???
4. Profit!

This should allow us to automate updates to the provider version and control the version drift.

[johnstcn]

Duplicate of coder/terraform-provider-coder#335 🤦