updated install_azure_cli.sh

setup/install_azure_cli.sh

@@ -62,7 +62,11 @@ EOF
     elif [ "$uname_s" = Darwin ]; then
         brew install azure-cli
     elif [ "$uname_s" = Linux ]; then
-        curl -L https://aka.ms/InstallAzureCli | bash
+        if type -P apk &>/dev/null; then
+            # only works on Alpine 3 - Alpine 2.x doesn't support --no-cache and nor does it have Python 3 package dependency which Azure CLI requires
+            apk add --no-cache curl python3 python3-dev alpine-sdk musl-dev libffi-dev openssl-dev
+        fi
+        yes | curl -L https://aka.ms/InstallAzureCli | bash
     echo
         echo "OS '$uname_s' is not Mac / Linux - not supported"
         exit 1