Update base image used in ko build (#1205) (#1212)

The default base image, cgr.dev/chainguard/static, no longer provides
all the platforms the Chains controller claims support for.

Signed-off-by: Luiz Carvalho <[email protected]>

Author: lcarva

.ko.yaml

@@ -0,0 +1,4 @@
+---
+# The default base image, cgr.dev/chainguard/static, no longer provides all the platforms the Chains
+# controller claims support for.
+defaultBaseImage: ghcr.io/wolfi-dev/static:alpine