refactor(docker): Consolidate RUN commands in RPM build Dockerfile

Combine build script creation and chmod into a single RUN instruction
to reduce Docker image layers and improve build efficiency.

Author: libraz

support/rpm/Dockerfile.rpmbuild

@@ -33,7 +33,8 @@ WORKDIR /workspace
 COPY . /workspace/
 
 # Create build script
-RUN cat > /build-rpm.sh << 'EOF'
+RUN cat > /build-rpm.sh << 'EOF' && chmod +x /build-rpm.sh \
+&& echo "Build script created successfully"
 #!/bin/bash
 set -e
 
@@ -94,7 +95,5 @@ else
 fi
 EOF
 
-RUN chmod +x /build-rpm.sh
-
 # Build script
 CMD ["/bin/bash", "/build-rpm.sh"]