Switch to Chainguard base image

Author: justinharringa

Dockerfile

@@ -1,4 +1,8 @@
-FROM gcr.io/distroless/base-debian11
+# syntax=docker/dockerfile:1.4
+# Use Wolfi/Chainguard Images
+# https://www.chainguard.dev/unchained/introducing-wolfi-the-first-linux-un-distro
+# https://github.com/chainguard-images/images#chainguard-images
+FROM cgr.dev/chainguard/static:latest
 
 COPY ./ci-result-to-slack /ci-result-to-slack