Update Dockerfile

Author: mcbarton

ci/docker/Dockerfile

@@ -34,7 +34,7 @@ RUN ARCH=$(uname -m) \
   &&   curl -sSLO https://github.com/ninja-build/ninja/releases/download/v1.12.1/ninja-linux-aarch64.zip ; \
   && else \
   &&   curl -sSLO https://github.com/ninja-build/ninja/releases/download/v1.12.1/ninja-linux.zip ; 
-  && fi \
+     fi \
   && unzip ninja*.zip \
   && rm *.zip \
   && mv ninja /opt/cmake/bin