Add preliminary script for new erlang infra

Signed-off-by: Harry Chen <i@harrychen.xyz>

erlang-new.sh

@@ -0,0 +1,47 @@
+#!/bin/bash
+set -e
+set -o pipefail
+
+_here=`dirname $(realpath $0)`
+apt_sync="${_here}/apt-sync.py" 
+yum_sync="${_here}/yum-sync.py"
+
+BASE_PATH="${TUNASYNC_WORKING_DIR}"
+BASE_URL="https://binaries2.erlang-solutions.com"
+
+YUM_PATH="${BASE_PATH}/centos"
+UBUNTU_PATH="${BASE_PATH}/ubuntu"
+DEBIAN_PATH="${BASE_PATH}/debian"
+export REPO_SIZE_FILE=/tmp/reposize.$RANDOM
+
+# generate codenames for repos
+ubuntu_os=(bionic focal jammy)
+debian_os=(bullseye buster)
+deb_suffixes=(
+    mongooseim-5
+    mongooseim-6
+    esl-erlang-24
+    esl-erlang-25
+    esl-erlang-26
+    elixir-1.12
+    elixir-1.13
+    elixir-1.14
+    elixir-1.15
+)
+
+function join_by { local IFS="$1"; shift; echo "$*"; }
+ubuntu_codenames=$(join_by ',' $(IFS=','; eval echo {"${ubuntu_os[*]}"}-{"${deb_suffixes[*]}"}))
+ubuntu_codenames=$(join_by ',' $(IFS=','; eval echo {"${debian_os[*]}"}-{"${deb_suffixes[*]}"}))
+
+# =================== APT repos ===============================
+
+"$apt_sync" --delete "${BASE_URL}/ubuntu" "$ubuntu_codenames" contrib amd64,arm64 "$UBUNTU_PATH"
+echo "Ubuntu finished"
+"$apt_sync" --delete "${BASE_URL}/debian" "$debian_codenames" contrib amd64,arm64 "$DEBIAN_PATH"
+echo "Debian finished"
+
+# =================== YUM repos ===============================
+# "$yum_sync" "${BASE_URL}/rpm/centos/@{os_ver}/@{arch}" 7 erlang x86_64 "@{os_ver}" "$YUM_PATH"
+# echo "YUM finished"
+
+"${_here}/helpers/size-sum.sh" $REPO_SIZE_FILE --rm