buildx failed with: ERROR: failed to solve: process "/bin/sh -c if [ -z \"$var\" ]; then git clone --branch release/$LLVM_VERSION.x --single-branch --depth 1 $LLVM_PROJECT /tmp/llvm-project/; else; git clone $LLVM_PROJECT /tmp/llvm-project/ && cd /tmp/llvm-project && git checkout $LLVM_COMIIT; fi" did not complete successfully: exit code: 2