ci: refactor terraform validation

Author: npalm

.github/workflows/terraform-validate-template.yml

@@ -58,4 +58,5 @@ jobs:
           github_token: ${{ secrets.GITHUB_TOKEN }}
       - name: Run TFLint
         run: |
+          tflint --init -c ${GITHUB_WORKSPACE}/.tflint.hcl
           tflint -c ${GITHUB_WORKSPACE}/.tflint.hcl --var-file ${GITHUB_WORKSPACE}/.github/lint/tflint.tfvars