Add OpenTofu setup and configuration for AWS infrastructure

- Create action for setting up OpenTofu environment
- Update Terraform workflow to use OpenTofu for infrastructure management
- Modify backend configuration for S3 with new bucket and region
- Add S3 bucket resources with lifecycle configuration
- Update local variables and remove deprecated files
- Include required Python packages for OpenTofu

.github/actions/setup-opentofu/action.yml

@@ -0,0 +1,15 @@
+name: Setup OpenTofu Environment
+description: Prepare the environment for A13labs CI/CD pipelines
+
+runs:
+  using: "composite"
+  steps:
+    - name: Setup OpenTofu
+      uses: opentofu/setup-opentofu@v1
+      with:
+        terraform_version: 1.9.1
+
+    - name: Install required python packages
+      shell: bash
+      run: |
+        python3 -m pip install -r requirements/opentofu.txt

.github/workflows/terraform-aws-iac-apply.yml

@@ -9,7 +9,7 @@ on:
     paths:
       - "terraform/aws-iac/**"
 jobs:
-  terraform-apply:
+  opentofu-apply:
     runs-on: ubuntu-latest
 
     steps:
@@ -21,15 +21,15 @@ jobs:
       - name: Setup environment
         uses: ./.github/actions/setup-env
 
-      - name: Setup Terraform environment
-        uses: ./.github/actions/setup-terraform-env
+      - name: Setup OpenTofu environment
+        uses: ./.github/actions/setup-opentofu-env
 
-      - name: Terraform Init and Apply
+      - name: OpenTofu Init and Apply
         env:
           BW_PROJECT_ID: ${{ secrets.BW_PROJECT_ID }}
           BW_ORGANIZATION_ID: ${{ secrets.BW_ORGANIZATION_ID }}
           BW_ACCESS_TOKEN: ${{ secrets.BW_ACCESS_TOKEN }}
         run: |
           cd terraform/aws-iac
-          sectool -f ../../sectool.json exec terraform init
-          sectool -f ../../sectool.json exec terraform apply --auto-approve
+          sectool -f ../../sectool.json exec tofu init
+          sectool -f ../../sectool.json exec tofu apply --auto-approve