[CI] Abort image building process if the npcap file non found

[pazone]

1.79 release caused a problem: the npcap-1.79.exe was missing and broken images were published despite of that.
Now it will stop building process if the required file is missing.

[mergify]

This pull request does not have a backport label. Could you fix it @pazone? 🙏
To fixup this pull request, you need to add the backport labels for the needed
branches, such as:

• backport-v./d./d is the label to automatically backport to the 1./d branch. /d is the digit
  NOTE: backport-skip has been added to this pull request.

[andrewkroh]

LGTM. I think there is also value in #383 which will fail the docker build if the file is not present.

[elasticmachine]

💚 Build Succeeded

• Buildkite Build
• Commit: 6eb7e86

History

• 💚 Build #209 succeeded 177790e
• 💚 Build #208 succeeded 7a52876

[elasticmachine]

💚 Build Succeeded

• Buildkite Build
• Commit: 6eb7e86

History

• 💚 Build #209 succeeded 177790e
• 💚 Build #208 succeeded 7a52876

[elasticmachine]

💚 Build Succeeded

• Buildkite Build
• Commit: 6eb7e86

History

• 💔 Build #306 failed 7a52876

[v1v]

@pazone , this PR should be backported, too; I added the required label.

All the changes in golang-crossbuild@main should be backported to the branch matching the support Golang versions by default. There might be cases that are not required... but the golden-rule is backport it

Golang supports two versions, that's the same principle for this particular repository.

In other words, as of today, Golang supports 1.21 and 1.20, and that's the same in this repository, with the difference that main is using 1.21.