Add tf-check (#7)

* Add `tf-check`

* Update README

* Add flag to execute recursively

* Removing flags for `diff`s

* Better messages

---------

Co-authored-by: Pedro Rodrigues <hpedrorodrigues@users.noreply.github.com>

Author: hpedrorodrigues

README.md

@@ -3,6 +3,7 @@
 - [envsubst](./envsubst)
 - [kustomize](./kustomize)
 - [setup-sphynx](./setup-sphynx)
+- [tf-check](./tf-check)
 
 ## Release
 

tf-check/Dockerfile

@@ -0,0 +1,3 @@
+FROM ghcr.io/hpedrorodrigues/tf
+COPY entrypoint.sh /
+ENTRYPOINT ["/entrypoint.sh"]

tf-check/README.md

@@ -0,0 +1,14 @@
+# tf-check
+
+Checks files recursively against a canonical format using [Terraform][terraform], [OpenTofu][opentofu] and [Terragrunt][terragrunt].
+
+## Usage
+
+```yaml
+- name: Lint
+  uses: hpedrorodrigues/actions/tf-check@v1.0.3
+```
+
+[terraform]: https://www.terraform.io
+[opentofu]: https://opentofu.org
+[terragrunt]: https://terragrunt.gruntwork.io

tf-check/action.yml

@@ -0,0 +1,9 @@
+name: tf-check
+author: Pedro Rodrigues
+description: Checks files recursively against a canonical format.
+branding:
+  icon: activity
+  color: gray-dark
+runs:
+  using: docker
+  image: Dockerfile

tf-check/entrypoint.sh

@@ -0,0 +1,17 @@
+#!/bin/sh
+
+set -o errexit
+set -o nounset
+
+if ${VERBOSE:-false}; then
+  set -o xtrace
+fi
+
+echo 'Checking Terraform files...'
+terraform fmt -check -recursive
+
+echo 'Checking OpenTofu files...'
+tofu fmt -check -recursive
+
+echo 'Checking Terragrunt files...'
+terragrunt hclfmt --terragrunt-check