feat: Add option for skip pushing if the digest hasn't changed

Dockerfile

@@ -1,6 +1,21 @@
+FROM alpine as certs
+
+RUN apk --update add ca-certificates
+
 FROM gcr.io/kaniko-project/executor:debug
 
+SHELL ["/busybox/sh", "-c"]
+
+RUN mkdir -p /usr/local/bin && \
+    wget -O /usr/local/bin/jq \
+    https://github.com/stedolan/jq/releases/download/jq-1.6/jq-linux64 && \
+    chmod +x /usr/local/bin/jq && \
+    wget -O /usr/local/bin/reg \
+    https://github.com/genuinetools/reg/releases/download/v0.16.1/reg-linux-386 && \
+    chmod +x /usr/local/bin/reg
+
 COPY entrypoint.sh /
+COPY --from=certs /etc/ssl/certs/ca-certificates.crt /etc/ssl/certs/ca-certificates.crt
 
 ENTRYPOINT ["/entrypoint.sh"]