Use alpine to replace ELOed centos

[taonic]

What was changed

centos is now EOL. Replace it with Alpine.

Checklist

1. Closes

2. How was this tested:

3. Any docs updates needed?

[turip]

Also it's strange but in our clusters with the latest master build we get the following:

promql-to-scrape-f688df656-twl9v    0/1     CrashLoopBackOff   8 (3m21s ago)   19m
cloud git:(main) ✗ k logs promql-to-scrape-f688df656-twl9v       
exec /usr/local/bin/promql-to-scrape: exec format error

While it's working completely fine with the build from this PR.

@taonic / @TimSimmons may I ask you to merge this PR?