Add build-gex script

scripts/build-gex

@@ -0,0 +1,40 @@
+#!/bin/bash
+
+# This script builds Gex for multiple platforms and creates a tarball for each platform.
+# It clones the Gex repository, checks out the specified version, and builds the binary for each platform.
+# The resulting tarballs are saved in the gex directory.
+
+set -e
+
+GIT_REPOSITORY="https://github.com/cosmos/gex.git"
+VERSION="v1.3.0"
+GOROOT=$(go env GOROOT)
+WORKDIR=$(pwd)
+PLATFORMS="darwin/amd64 darwin/arm64 linux/amd64 linux/arm64"
+
+# Cleans up temporary files and directories
+clean_up() {
+    test -d "$tmp_dir" && rm -fr "$tmp_dir"
+}
+
+# Creates a temporary directory and sets up a trap to clean it up on exit
+tmp_dir=$(mktemp -d -t gex.XXXXXX)
+trap "clean_up $tmp_dir" EXIT
+
+# Clones the Gex repository into the temporary directory
+git clone ${GIT_REPOSITORY} ${tmp_dir} --depth 1
+cd ${tmp_dir}
+echo
+
+# Builds Gex for each platform and creates a tarball for each one
+for platform in ${PLATFORMS}
+do
+        goos=${platform%/*}
+        goarch=${platform#*/}
+
+        echo "Building Gex for $goos/$goarch"
+        GOOS=$goos GOARCH=$goarch go build -o gex 2>&1
+
+        out="${WORKDIR}/gex/gex-${VERSION}-${goarch}-${goos}.tar.gz"
+        tar -czf ${out} gex
+done