Clear apt cache to reduce image size
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		@@ -3,4 +3,7 @@ FROM rustlang/rust:nightly
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RUN cargo install --force clippy cargo-cov && \
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					RUN cargo install --force clippy cargo-cov && \
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    echo deb http://ftp.debian.org/debian stretch-backports main >> /etc/apt/sources.list && \
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					    echo deb http://ftp.debian.org/debian stretch-backports main >> /etc/apt/sources.list && \
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    apt update && \
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					    apt update && \
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    apt install -y llvm-6.0
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					    apt install -y \
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					      llvm-6.0
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					      && \
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					    rm -rf /var/lib/apt/lists/*
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