Clean /tmp after installation

as a result of

RUN OPENTOFU_VERSION=1.6.2 /bin/sh -c curl --proto '=https' --tlsv1.2 -fsSL https://get.opentofu.org/install-opentofu.sh -o install-opentofu.sh &&     chmod +x install-opentofu.sh &&     ./install-opentofu.sh --install-method standalone --opentofu-version "${OPENTOFU_VERSION}" &&     rm ./install-opentofu.sh  tofu --version

the /tmp folder comes with ~23MB of garbage in the image

~ # ls -lh /tmp/*
total 23M    
-rw-r--r--    1 root     root        2.3K May 13 09:25 tofu_1.6.2_SHA256SUMS
-rw-r--r--    1 root     root        3.1K May 13 09:25 tofu_1.6.2_SHA256SUMS.pem
-rw-r--r--    1 root     root          96 May 13 09:25 tofu_1.6.2_SHA256SUMS.sig
-rw-r--r--    1 root     root       23.1M May 13 09:25 tofu_1.6.2_linux_amd64.zip