Rootfs: Add curl to alpine rootfs builder.

If alpine image is created inside a container,
it does not get any golang version data. It will try
to get it by installing yq. To install yq curl is used.

Signed-off-by: Carlos Venegas <jos.c.venegas.munoz@intel.com>

tools/osbuilder/rootfs-builder/alpine/Dockerfile.in

@@ -8,5 +8,6 @@ FROM ${IMAGE_REGISTRY}/alpine:3.13.5
 
 RUN apk update && apk add \
 		  bash \
+		  curl \
 		  coreutils \
 		  binutils