build: Use ko for image building #1379

All 100 tests pass in 0s

100 tests ±0 100 ✔️ ±0 0s ⏱️ ±0s
  24 suites ±0     0 💤 ±0
    1 files ±0     0 ❌ ±0

Results for commit b4dde60. ± Comparison against earlier commit 82721b4.