Download static cURL into release Docker image for all supported architectures (#20424)

Download static cURL into release Docker image for all supported architectures.

Currently, the static cURL executable is only downloaded for the `amd64` architecture. However, `arm64` and `ppc64le` variants are also [available](https://github.com/moparisthebest/static-curl/releases/tag/v8.7.1).

dockerscripts/download-static-curl.sh

@@ -0,0 +1,20 @@
+#!/bin/bash
+
+function download_arch_specific_executable {
+	curl -f -L -s -q \
+		https://github.com/moparisthebest/static-curl/releases/latest/download/curl-$1 \
+		-o /go/bin/curl || exit 1
+	chmod +x /go/bin/curl
+}
+
+case $TARGETARCH in
+"arm64")
+	download_arch_specific_executable aarch64
+	;;
+"s390x")
+	echo "Not downloading static cURL because it does not exist for the $TARGETARCH architecture."
+	;;
+*)
+	download_arch_specific_executable "$TARGETARCH"
+	;;
+esac