FAB-5412 add fabric-preload.sh script

Add a script to allow users to preload the Fabric docker
images without having to run the curl command in the RTD.

Change-Id: I3b6c682c3e2ab1f230f7af8c3ce0b95bbb8fd024
Signed-off-by: Christopher Ferris <chrisfer@us.ibm.com>

Author: christo4ferris

scripts/README.md

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+## Hyperledger Fabric Samples
+
+fabric-preload.sh will preload all of the requisite docker images for Hyperledger Fabric and tag them
+with the 'latest' tag. Optionally, specify a specific version (e.g. 1.0.1). Default version is 1.0.0.
+
+```bash
+./fabric-preload.sh [version]
+```
+
+<a rel="license" href="http://creativecommons.org/licenses/by/4.0/"><img alt="Creative Commons License" style="border-width:0" src="https://i.creativecommons.org/l/by/4.0/88x31.png" /></a><br />This work is licensed under a <a rel="license" href="http://creativecommons.org/licenses/by/4.0/">Creative Commons Attribution 4.0 International License</a>

scripts/fabric-preload.sh

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+#!/bin/bash
+#
+# Copyright IBM Corp. All Rights Reserved.
+#
+# SPDX-License-Identifier: Apache-2.0
+#
+
+export VERSION=${1:-1.0.0}
+export ARCH=$(echo "$(uname -s|tr '[:upper:]' '[:lower:]'|sed 's/mingw64_nt.*/windows/')-$(uname -m | sed 's/x86_64/amd64/g')" | awk '{print tolower($0)}')
+#Set MARCH variable i.e ppc64le,s390x,x86_64,i386
+MARCH=`uname -m`
+
+dockerFabricPull() {
+  local FABRIC_TAG=$1
+  for IMAGES in peer orderer couchdb ccenv javaenv kafka zookeeper tools; do
+      echo "==> FABRIC IMAGE: $IMAGES"
+      echo
+      docker pull hyperledger/fabric-$IMAGES:$FABRIC_TAG
+      docker tag hyperledger/fabric-$IMAGES:$FABRIC_TAG hyperledger/fabric-$IMAGES
+  done
+}
+
+dockerCaPull() {
+      local CA_TAG=$1
+      echo "==> FABRIC CA IMAGE"
+      echo
+      docker pull hyperledger/fabric-ca:$CA_TAG
+      docker tag hyperledger/fabric-ca:$CA_TAG hyperledger/fabric-ca
+}
+
+: ${CA_TAG:="$MARCH-$VERSION"}
+: ${FABRIC_TAG:="$MARCH-$VERSION"}
+
+echo "===> Pulling fabric Images"
+dockerFabricPull ${FABRIC_TAG}
+
+echo "===> Pulling fabric ca Image"
+dockerCaPull ${CA_TAG}
+echo
+echo "===> List out hyperledger docker images"
+docker images | grep hyperledger*
+