Issue #87: Adds reusable workflow for terraform linting

.github/workflows/workflow-terraform-check.md

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+# Reusable Workflow for Terraform Conformance to AI Lab Standards
+
+## Overview
+
+This workflow ensures that Terraform configurations align with the AI Lab's
+standards for infrastructure as code. It is designed to automate the enforcement
+of code quality and organizational best practices for Terraform files across
+various projects.
+
+## Usage
+
+- **Purpose:** Automatically validate and enforce coding standards for Terraform
+  configurations within the organization. It triggers on **workflow calls** to
+  repositories and **pushes** to this repository, performing checks to ensure
+  Terraform files comply with predefined standards.
+- **Steps:**
+  - **Terraform Format Check:** Verifies that Terraform files are formatted
+    according to Terraform's conventions using `terraform fmt`.
+  - **TFLint Check:** Runs TFLint to lint Terraform files, identifying potential
+    issues and deviations from best practices.
+- **Input:** Optionally specify a custom configuration file path for TFLint to
+  use a specific set of rules. 
+
+## Terraform Linting Guidelines for Developers
+
+- Developers are encouraged to use the [Terraform
+  linters/TFLint](https://github.com/terraform-linters/tflint) tool for locally
+  linting their Terraform files.
+
+## Custom Configuration
+
+If your project requires specific linting rules beyond the AI Lab's standard
+set, you can create a `.tflint.hcl` file in your project's root directory.
+Specify the path to this file when triggering the workflow to apply your custom
+rules. The format and options for this configuration file are documented in the
+[TFLint Configuration File Format]
+(https://github.com/terraform-linters/tflint/blob/master/docs/user-guide/config.md).

.github/workflows/workflow-terraform-check.yml

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+---
+name: Check Terraform conformance to AI Lab standards
+
+on:
+  workflow_call:
+    inputs:
+      config-file-path:
+        required: false
+        type: string
+
+jobs:
+  terraform-format-check:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+
+      - name: Setup Terraform
+        uses: hashicorp/setup-terraform@v1
+        with:
+          terraform_version: latest
+
+      - name: Terraform Initialization
+        run: terraform init
+
+      - name: Terraform Format Check
+        run: terraform fmt -check -recursive -diff
+
+      - uses: terraform-linters/setup-tflint@v3
+        name: Setup TFLint
+        with:
+          tflint_version: v0.44.1
+
+      - name: Init TFLint
+        run: tflint --init
+
+      - name: Run TFLint
+        run: |
+          if [ -n "${{ github.event.inputs.config-file-path }}" ]; then
+            tflint --recursive --config \
+            "${{ github.workspace }}/
+            ${{ github.event.inputs.config-file-path }}"
+          else
+            tflint --recursive
+          fi