Add wp-version input to setup-wordpress action

Introduces a 'wp-version' input to the setup-wordpress composite action, allowing the WordPress version to be specified (defaulting to 6.8). Updates the schema-linter workflow to use this input, improving flexibility for WordPress version management in CI.

Author: josephfusco

.github/actions/setup-wordpress/action.yml

@@ -1,6 +1,12 @@
 name: Set up WordPress
 description: Sets up WordPress. Assumes mariadb is available as a service.
 
+inputs:
+  wp-version:
+    description: 'WordPress version to install'
+    required: false
+    default: '6.8'
+
 runs:
   using: 'composite'
   steps:
@@ -23,6 +29,8 @@ runs:
 
     - name: Setup WordPress
       shell: bash
+      env:
+        WP_VERSION: ${{ inputs.wp-version }}
       run: |
         cp .env.dist .env
         composer run install-test-env

.github/workflows/schema-linter.yml

@@ -38,6 +38,8 @@ jobs:
 
       - name: Setup WordPress
         uses: ./.github/actions/setup-wordpress
+        with:
+          wp-version: '6.8'
 
       - name: Setup GraphQL Schema Linter
         run: npm install -g graphql-schema-linter@^3.0 graphql@^16
@@ -77,11 +79,7 @@ jobs:
           name: schema.graphql
           path: /tmp/schema.graphql
 
-      # The Schema Inspector step is allowed to fail (continue-on-error: true) to avoid blocking the workflow on schema breaking changes.
-      # This is intentional, as schema diffs are currently monitored manually due to ongoing compatibility work with WordPress 6.9.
-      # Please review any breaking changes reported by this step before merging or releasing.
       - name: Run Schema Inspector
-        continue-on-error: true
         run: |
           # This schema and previous release schema
           node_modules/.bin/graphql-inspector diff /tmp/${{ steps.get-latest-tag.outputs.tag }}.graphql /tmp/schema.graphql