Enable wrapper validation by default

- Add 'allow-snapshot-wrappers' input parameter
- Default 'validate-wrappers' to 'true'

Fixes #12

.github/actions/init-integ-test/action.yml

@@ -9,6 +9,11 @@ runs:
         distribution: 'temurin'
         java-version: 11
 
+    - name: Configure environment
+      shell: bash
+      run: |
+        echo "ALLOWED_GRADLE_WRAPPER_CHECKSUMS=e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855" >> "$GITHUB_ENV"
+
     # Downloads a 'dist' directory artifact that was uploaded in an earlier 'build-dist' step
     - name: Download dist
       if: ${{ env.SKIP_DIST != 'true' && !env.ACT }}

.github/workflows/integ-test-wrapper-validation.yml

@@ -29,8 +29,8 @@ jobs:
     - name: Run wrapper-validation-action
       id: setup-gradle
       uses: ./setup-gradle
-      with:
-        validate-wrappers: true
+      env:
+        ALLOWED_GRADLE_WRAPPER_CHECKSUMS: ''
       continue-on-error: true
 
     - name: Check failure