This pipeline performs: Add 3 + 7 → × 9 → Print Result
job_1: echo $((3 + 7)) → math-homework.txt
job_2: cat math-homework.txt → value × 9 → new math-homework.txt
job_3: cat math-homework.txt → print "🧠 The result is: $value"
Generated on ubuntu, macOS, and windows
upload: echo "hello from ${{ matrix.os }}" > file-${{ matrix.os }}.txt
download: download artifacts → merged into /my-artifacts/