Added Set up Docker Compose step to fix CI failure. Context(actions/runner-images#11766 (comment))

Author: nikhil-ctds

.github/workflows/pr-proxy-tests.yml

@@ -23,6 +23,11 @@ jobs:
       with:
         java-version: 17
 
+    - name: Set up Docker Compose
+      uses: docker/setup-compose-action@v1
+      with:
+        version: latest
+
     - name: Start and init the oauth server
       run: ./ci/init_hydra_oauth_server.sh
       timeout-minutes: 5