Simplify CI scripting

Keep CI/CD workflow steps readable and maintainable by consolidating repeated commands and using basic shell utilities for log processing.

Apply these rules:

• Consolidate repeated tool invocations into one command where supported (e.g., pass multiple paths at once).
• For creating empty files, use touch file rather than cat > file.
• For simple transformations/filters of a log, prefer bash + coreutils (e.g., sed, uniq) over adding a JavaScript cleanup step.

Example (PR log cleanup + artifact):

# Run lint and capture output
fpb-lint ./books/ &>> output.log || echo "Analyzing..."
fpb-lint ./casts/ &>> output.log || echo "Analyzing..."
fpb-lint ./courses/ &>> output.log || echo "Analyzing..."
fpb-lint ./more/ &>> output.log || echo "Analyzing..."

# Prepare artifact
mkdir -p ./pr
echo "$PR_URL" > ./pr/PRurl

# Bash cleanup (single-line transformation + dedupe)
cat output.log | sed -E 's:/home/runner/work/free-programming-books/|⚠.+::' | uniq > ./pr/error.log

If the cleanup logic becomes complex enough that shell becomes unreadable, then (and only then) consider a script—but default to the simplest working approach.