feat(tofu): add ability to specify required tofu version

.gitea/workflows/otf-plan.yml

@@ -1,6 +1,11 @@
 name: tf-plan
 on:
   workflow_call:
+    inputs:
+      tofu-version:
+        required: false
+        default: 1.7.1
+        type: string
     secrets:
       gpg-key:
         required: true
@@ -23,7 +28,7 @@ jobs:
     steps:
       - uses: opentofu/setup-opentofu@v1
         with:
-          tofu_version: 1.7.1
+          tofu_version: ${{ inputs.tofu-version }}
           cli_config_credentials_token: ${{ secrets.tf-api-token }}
       - name: Clone repo
         uses: actions/checkout@v4