cmdeploy: make it work without bash

Co-authored-by: link2xt <link2xt@testrun.org>

scripts/initenv.sh

@@ -1,13 +1,16 @@
-#!/bin/bash
+#!/bin/sh
 set -e
 
-if [[ $(lsb_release -is 2> /dev/null) == "Ubuntu" || $(lsb_release -is 2> /dev/null) == "Debian" ]]
-then
-  if [ $(dpkg -l | grep python3-dev 2>&1 /dev/null) ]
-  then
-    echo "You need to install python3-dev for installing the other dependencies."
-    exit 1
-  fi
+if command -v lsb_release 2>&1 >/dev/null; then
+  case "$(lsb_release -is)" in
+    Ubuntu | Debian )
+      if ! dpkg -l | grep python3-dev 2>&1 >/dev/null
+      then
+        echo "You need to install python3-dev for installing the other dependencies."
+        exit 1
+      fi
+      ;;
+  esac
 fi
 
 python3 -m venv --upgrade-deps venv