bug(misconf): incorrect handling of Docker RUN instructions with ';'

[nikpivkin]

Example dockerfile:

FROM debian:trixie

RUN <<EOF
apt-get update
apt-get install --no-install-recommends -y gettext
EOF

The RUN instruction is transformed into apt-get update ; apt-get install --no-install-recommends -y gettext, but commands separated by ; are currently handled incorrectly.

Affected checks:

• DS-0017

Discussed in #9334

[simar7]

Closed via aquasecurity/trivy-checks#473