fix: modified input to be string instead of boolean since github cannot handle boolean

.github/workflows/format-nix.yml

@@ -4,15 +4,15 @@ on:
   workflow_call:
     inputs:
       ci_mode:
-        description: 'Run treefmt with --ci (fail if changes needed)'
-        type: boolean
+        description: "Run treefmt with --ci (fail if changes needed)"
+        type: string
         required: false
-        default: true
+        default: "true"
       commit_changes:
-        description: 'Commit changes if formatting is needed (only if ci_mode is false)'
-        type: boolean
+        description: "Commit changes if formatting is needed (only if ci_mode is false)"
+        type: string
         required: false
-        default: false
+        default: "false"
 
 jobs:
   treefmt:
@@ -31,6 +31,10 @@ jobs:
         with:
           name: nix-community
           authToken: "${{ secrets.CACHIX_AUTH_TOKEN }}"
+      - name: debug inputs
+        run: |
+          echo "ci_mode: ${{ inputs.ci_mode }}"
+          echo "commit_changes: ${{ inputs.commit_changes }}"
       - name: treefmt
         run: |
           if [ "${{ inputs.ci_mode }}" = "true" ]; then