MCOL-6071 drone refactor (#3641)

* chore(ci): MCOL-6071 less sccache granularity

* chore(ci): MCOL-6071 clean old versions of .deb/.rpm files in s3 when publishing

* chore(ci): MCOL-6071 fix unittests execution

* install sccache after deps, to have curl

* chore(ci) MCOL-6071 review fixes

---------

Co-authored-by: Leonid Fedorov <leonid.fedorov@mariadb.com>

build/install_clang_deb.sh

@@ -0,0 +1,28 @@
+#!/bin/bash
+
+set -eo pipefail
+
+SCRIPT_LOCATION=$(dirname "$0")
+source "$SCRIPT_LOCATION"/utils.sh
+
+CLANG_VERSION="$1"
+
+if [[ $# -ne 1 ]]; then
+  echo "Please pass clang-version as a first parameter"
+  exit 1
+fi
+
+change_ubuntu_mirror us
+
+message "Installing clang-${CLANG_VERSION}"
+
+retry_eval 5 apt-get clean && apt-get update && apt-get install -y wget curl lsb-release software-properties-common gnupg
+wget https://apt.llvm.org/llvm.sh
+bash llvm.sh $CLANG_VERSION
+export CC=/usr/bin/clang
+export CXX=/usr/bin/clang++
+
+
+
+
+