Make format image customizable

Author: FranzBusch

.github/workflows/soundness.yml

@@ -43,6 +43,10 @@ on:
         type: boolean
         description: "Boolean to enable the format check job. Defaults to true."
         default: true
+      format_check_container_image:
+        type: string
+        description: "Container image for the format check job. Defaults to latest Swift Ubuntu image."
+        default: "swift:6.0-noble"
       shell_check_enabled:
         type: boolean
         description: "Boolean to enable the shell check job. Defaults to true."
@@ -147,7 +151,7 @@ jobs:
     if: ${{ inputs.format_check_enabled }}
     runs-on: ubuntu-latest
     container:
-      image: swift:6.0-jammy
+      image: ${{ inputs.format_check_container_image }}
     timeout-minutes: 10
     steps:
       - name: Checkout repository