fix(ci): pin sh-checker action and restrict workflow permissions #216
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Pin luizm/action-sh-checker from @master to @v0.9.0 to prevent
automatic execution of potentially malicious upstream commits. Using
a mutable branch reference like @master creates a supply chain attack
vector where any new code pushed upstream would run in our CI without
review.
Additionally, add contents: read permission to the shell job following
the principle of least privilege. This restricts the workflow to only
the permissions it needs to checkout and lint shell scripts.
Changes: