Add step to login github

Author: mehr74

.github/workflows/terraform.yaml

@@ -16,6 +16,10 @@ on:
       aws-iam-role-arn:
         required: true
         type: string
+    secrets:
+      github-token:
+        description: Token to download Terraform modules from GitHub
+        required: true
 
 permissions:
   id-token: write
@@ -58,6 +62,10 @@ jobs:
         with:
           terraform_wrapper: false
 
+      - name: Setup Git for Private Modules
+        run: |
+          git config --global url."https://mehr74:${{ secrets.github-token }}@github.com/optiop".insteadOf "https://github.com/optiop"
+
       - name: Terraform init
         run: terraform -chdir=${{ inputs.path }} init -no-color