feat: run code snippet

[yottahmd]

Example:

name: example
steps:
  - name: step 1
    command: "bash"
    script: |
      cd /tmp
      echo "hello world" > hello
      cat hello
    output: RESULT
  - name: step 2
    command: echo ${RESULT} # hello world
    depends:
      - step 1

[codecov-commenter]

Codecov Report

Merging #108 (9b626e0) into main (58a17ca) will increase coverage by 0.61%.
The diff coverage is 86.11%.

@@            Coverage Diff             @@
##             main     #108      +/-   ##
==========================================
+ Coverage   83.13%   83.75%   +0.61%     
==========================================
  Files          37       37              
  Lines        2752     2800      +48     
==========================================
+ Hits         2288     2345      +57     
+ Misses        339      331       -8     
+ Partials      125      124       -1     

Impacted Files	Coverage Δ
internal/config/step.go	100.00% <ø> (ø)
internal/scheduler/node.go	90.14% <83.05%> (+7.93%)	⬆️
internal/config/config.go	84.00% <100.00%> (+0.16%)	⬆️
internal/scheduler/scheduler.go	86.94% <100.00%> (+0.22%)	⬆️
internal/utils/utils.go	87.09% <100.00%> (ø)

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