Docs: Handle long commit messages in [skip ci] example

[dbaston]

git log will wrap longer commit messages onto multiple lines, in which case a commit with [skip ci] will not cause a build to skip.

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📚 Documentation previews 📚

• User's documentation (docs): https://docs--11601.org.readthedocs.build/en/11601/

• Developer's documentation (dev): https://dev--11601.org.readthedocs.build/en/11601/

[humitos]

Thanks for the PR. Can you post some examples? I'm not being able to make it work with a multi-line commit.

[dbaston]

git commit -m "a single line message"
(git --no-pager log --pretty="tformat:%s -- %b" -1 | paste -s -d ' ' | grep -viq "skip ci") || echo "EXIT"
# no output

git commit -m "a single line message [skip ci]"
(git --no-pager log --pretty="tformat:%s -- %b" -1 | paste -s -d ' ' | grep -viq "skip ci") || echo "EXIT"
# EXIT

git commit -m "a double line message" -m "[skip ci]"
(git --no-pager log --pretty="tformat:%s -- %b" -1 | paste -s -d ' ' | grep -viq "skip ci") || echo "EXIT"
# EXIT

git commit -m "a double line message" -m "a really long second line $(ps aux) [skip ci]"
(git --no-pager log --pretty="tformat:%s -- %b" -1 | paste -s -d ' ' | grep -viq "skip ci") || echo "EXIT"
# EXIT