feat: Add support for multiple init-script

[sunggun-yu]

• implement an array type for init-script with the run keyword
• maintain backward compatibility for init-script as a single string
• upgrade Go YAML version from v2 to v3
• corrected typos in comments

Multiple init-script will be useful for reusable command with YAML Anchor

example of multiple init-script

commons:
  gcloud-login: &commons-gcloud-login |
    echo "login gcloud ..."
    gcloud auth login

profiles:
  my-profile-1:
    env:
      - name: VAR
        value: val
    init-script: |
      echo "meow"
      echo "woof"

  my-profile-2:
    env:
      - name: VAR
        value: val
    init-script: |
      - run: echo meow
      - run: |
          echo "woof"
          echo "meow"
      - file: "/some/path/this-will-be-ignored-only-run-keyword-is-supported"

  my-profile-3:
    env:
      - name: TEST1
        value: ~/.config
    init-script:
      - run: |
          echo "getting password from keepass ..."
          keepassxc-cli show -sa password /Users/myusuer/Documents/KeePass/default.kdbx test
      - run: *commons-gcloud-login
      - run: |
          echo "configure docker login for gcr ..."
          gcloud auth configure-docker gcr.io

  my-profile-4:
    env:
      - name: TEST1
        value: ~/.config
    init-script:
      - run: *commons-gcloud-login
      - run: |
          echo "configure docker login for gcr ..."
          gcloud auth configure-docker gcr.io

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (1c92017) 93.84% compared to head (66d6f04) 94.28%.
Report is 21 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #101      +/-   ##
==========================================
+ Coverage   93.84%   94.28%   +0.44%     
==========================================
  Files          17       18       +1     
  Lines         682      735      +53     
==========================================
+ Hits          640      693      +53     
  Misses         24       24              
  Partials       18       18              

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