Add upgrade command in Dockerfile_iptables

Fix trivy warning on vulnerable libcrypto package
-> No newer alpine image on dockerhub

Signed-off-by: Nicolas JENDROWIAK <75165555+shkuviak@users.noreply.github.com>

Dockerfile_iptables

@@ -12,8 +12,10 @@ RUN --mount=type=cache,sharing=locked,id=gomod,target=/go/pkg/mod/cache \
     CGO_ENABLED=0 GOOS=linux make build
 
 FROM alpine:3.18.4
-# Add Certificates into the image, for anything that does API calls
-RUN apk add --no-cache iptables
+# Update pkgs and add iptables
+RUN apk upgrade && \
+    apk add --no-cache iptables 
+
 # Add kube-vip binary
 COPY --from=dev /src/kube-vip /
 ENTRYPOINT ["/kube-vip"]