chore(el7): add script to get protobuf compiler

Author: thalesmg

el7/Dockerfile

@@ -40,6 +40,10 @@ RUN yum groupinstall -y "Development Tools" && \
 
 ADD install-openssl11.sh get-git.sh get-automake.sh get-cmake.sh /
 
+COPY el9/get-protoc.sh /get-protoc.sh
+
+RUN /get-protoc.sh
+
 WORKDIR /
 
 # We need git >= 2.18 otherwise actions/checkout@v3 in github

el7/get-protoc.sh

@@ -0,0 +1,21 @@
+#!/usr/bin/env bash
+
+set -euo pipefail
+
+cd /tmp
+
+PB_REL="https://github.com/protocolbuffers/protobuf/releases"
+VSN="33.1"
+
+case $(uname -m) in
+  x86_64)
+    ARCH="x86_64"
+    ;;
+  *)
+    ARCH="aarch_64"
+    ;;
+esac
+
+curl -LO "$PB_REL/download/v$VSN/protoc-$VSN-linux-$ARCH.zip"
+# zip contains `bin/protoc`
+unzip "protoc-$VSN-linux-$ARCH.zip" -d /usr/local/