Fix incorrect copy . . handling

[dobrac]

Fix incorrect copy . . handling.

When the COPY . . instruction was used, all files were in the unpacked directory. Because the copy is detected by ls -A | head -n 1 and the parent folder was tmp, invalid decision was done and incorrect folder was copied. Adding a nested folder should fix it as the parent folder will have only one folder, the unpack one.

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Note

Fixes COPY handling by unpacking into a nested dir, correctly moving hidden files, and adding debug-logged execution.

• Build/Copy Command:
  • Unpack into nested /tmp/<hash>/unpack to correctly handle COPY . . root detection.
  • Move directory contents via find ... -exec mv to include hidden files.
• Logging:
  • Use RunCommandWithLogger with provided logger at zapcore.DebugLevel for the unpack/move step.

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[linear]

ENG-3145 Fix incorrect COPY . . handling

[jakubno]

Looks good, but could you add a test with polluting /tmp? 🙏🏻

[dobrac]

Looks good, but could you add a test with polluting /tmp? 🙏🏻

there are currently no tests for the copy instruction at all. I would propose to add them in another PR as it requires non-trivial workflow setup