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Multiple consecutive RUN instructions.
Superseded by tally/prefer-run-heredoc, which provides the same check with enhanced detection (consecutive RUNs and chained commands) and auto-fix support using heredoc syntax.

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Description

Multiple consecutive RUN instructions can be consolidated into a single instruction to reduce image layers.

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Examples

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Problematic code

FROM ubuntu
RUN apt-get update
RUN apt-get install -y curl

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Correct code

FROM ubuntu
RUN apt-get update && apt-get install -y curl
Or with heredoc syntax (tally auto-fix): 
FROM ubuntu
RUN <<EOF
apt-get update
apt-get install -y curl
EOF

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Reference