fix: support concurrent agent runs by checking if Trivy is installed

[joaoacmota]

Please review, as it addresses and closes #15

[CLAassistant]

All committers have signed the CLA.

[a-poluyanov]

Friend, I like your proposal, and I even created an issue on this topic. But you need to improve it. You check if the banary file exists before uploading here

const installedAlready = task.exist(localPath + "/" + artifact)
    if (installedAlready) 

But your code does not take into account that if I downloaded version 0.55.0 and then changed the version to 0.55.1 in my pipeline, it will skip the download and use the old version, this is not correct and can break the logic that the developer intended.

const versionFilePath = path.join(localPath, "trivy_version.txt");

I can help you refine it if you want, I suggest accepting this change after successful refinement