Patcher test (#100)

* chore: WIP - Patcher test

* chore: test a sample patch

.patcher/config.yml

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+versions:
+  - tag: v0.10.2
+    patches:
+      - slug: "sample-breaking-change"
+        modules_affected:
+          - patcher-test

.patcher/patches/sample-breaking-change/patch.yaml

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+name: "Sample Breaking Change"
+description: A sample breaking change that renames a resource
+author: Gruntwork
+
+# Optional list of dependencies that the patch requires.
+dependencies:
+  - name: terrapatch
+    version: "0.1.0"
+
+# List of steps that this patch should execute.
+# Each step has a name field (string) and a run field, which can denote either an OS command, or an external script to be run.
+# If there are any external scripts, then make sure you include these in the same directory where the patch.yaml file is.
+steps:
+  - name:
+    run: terrapatch move-resource --path $PATCHER_MODULE_PATH terraform $PATCHER_MODULE_ADDRESS module.null_resource.test2

modules/patcher-test/README.md

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+# Operating System Module
+
+This is a module that can be used to figure out what operating system is being used to run Terraform. This may be used
+to modify Terraform's behavior depending on the OS, such as modifying the way you format file paths on Linux vs 
+Windows (see also the [join-path module](/modules/join-path)). 
+
+This module uses Python under the hood so, the Python must be installed on the OS. 
+
+
+
+
+## Example code
+
+See the [operating-system example](/examples/operating-system) for working sample code.
+
+
+
+
+## Usage
+
+Simply use the module in your Terraform code, replacing `<VERSION>` with the latest version from the [releases
+page](https://github.com/gruntwork-io/terraform-aws-utilities/releases):
+
+```hcl
+module "os" {
+  source = "git::git@github.com:gruntwork-io/terraform-aws-utilities.git//modules/operating-system?ref=<VERSION>"
+}
+```
+
+* You can now get the name of the operating system from the `name` output, which will be set to either `Linux`, 
+  `Darwin`, or `Windows`
+
+* You can also get the path separator for the current OS—backslash for Windows, forward slash everywhere else—from the
+  `path_separator` output.
+
+```hcl
+operating_system_name = "${module.os.name}"
+path_separator        = "${module.os.path_separator}"
+```
+

modules/patcher-test/main.tf

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+terraform {
+  required_version = ">= 1.0.0"
+}
+
+data "external" "os" {
+  program = ["python3", "-c", <<-EOF
+      import json
+      import os
+      import platform
+
+      print(json.dumps({
+          "platform": platform.system(),
+          "path_separator": os.sep,
+      }))
+    EOF
+  ]
+}

modules/patcher-test/outputs.tf

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+output "name" {
+  value = data.external.os.result.platform
+}
+
+output "path_separator" {
+  value = data.external.os.result.path_separator
+}