Pull 21 base image.

Author: zzhlogin

.github/workflows/pr-build.yml

@@ -98,6 +98,10 @@ jobs:
         if: ${{ matrix.os == 'ubuntu-latest' }}
         run: docker pull public.ecr.aws/docker/library/amazoncorretto:23-alpine
 
+      - name: Pull base image of Contract Tests Sample Apps V21
+        if: ${{ matrix.os == 'ubuntu-latest' }}
+        run: docker pull public.ecr.aws/docker/library/amazoncorretto:21-alpine
+
       - name: Run contract tests
         uses: gradle/gradle-build-action@v3
         if: ${{ matrix.os == 'ubuntu-latest' }}