switch to chainguard images

Containerfile

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+FROM cgr.dev/chainguard/go:latest as build
+
+ARG GO_CMD=funbot
+ENV CGO_ENABLED=0 \
+    GOARCH=amd64 \
+    GOOS=linux
+
+WORKDIR /app
+
+ADD . /app/
+
+RUN go build -ldflags "-X main.release=$(git rev-parse --short HEAD) -s -w -extldflags '-static'" -o /main ./cmd/${GO_CMD}/
+
+FROM cgr.dev/chainguard/static:latest
+COPY --chown=65534:0 --from=build /main /
+USER 65534
+WORKDIR /
+
+CMD ["/main"]