cross-build-start / cross-build-end doesn't match if full path is used

[zrzka]

Description

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TL;DR;

User has RUN [ "/usr/bin/cross-build-end" ] in the Dockerfile (and same for -start). When the full path was removed (RUN [ "cross-build-end" ]), issue was fixed.

Test case

package main
import (
	"fmt"
	"os"
)

func main() {
  fmt.Println(os.Args[0])
}

Built, moved to ~/bin.

 ~ zrzka
zrzka
 ~ ~/bin/zrzka 
/Users/robertvojta/bin/zrzka
 ~ 

It's caused by this and this case statement.

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