Add install protoc script

bin/install-protoc

@@ -0,0 +1,14 @@
+#!/usr/bin/env bash
+
+set -x
+set -e
+
+PROTOC_VERSION=${PROTOC_VERSION:-3.7.1}
+PROTOC_ZIP=protoc-$PROTOC_VERSION-linux-x86_64.zip
+TMP_DIR=$(mktemp --directory)
+DEST_FILE=$TMP_DIR/$PROTOC_ZIP
+URL=https://github.com/protocolbuffers/protobuf/releases/download/v$PROTOC_VERSION/$PROTOC_ZIP
+curl --output "$DEST_FILE" --location $URL
+sudo unzip -o "$DEST_FILE" -d /usr/local bin/protoc
+sudo unzip -o "$DEST_FILE" -d /usr/local 'include/*'
+rm -rfv "$TMP_DIR"