build: reduce Cloud Run web service memory limit to 256Mi for maximum cost optimization

Author: rozen03

.github/workflows/google-cloudrun-docker.yml

@@ -76,6 +76,7 @@ jobs:
             --image $TAG \
             --region ${{ env.PROJECT_REGION }} \
             --service-account ${{ vars.GCP_SA_EMAIL }} \
+            --memory=256Mi \
             --max-instances=${{ vars.GCP_SERVICE_API_MAX_INSTANCES }} \
             --set-secrets=TELEGRAM_BOT_TOKEN=${{ vars.GCP_SECRET_TG_BOT_TOKEN }}:latest \
             --set-secrets=DB_USER=${{ vars.GCP_SECRET_DB_USER }}:latest \