Reset default PATH settings for Zsh

- Export environment variables to /tmp/environment

NOTES.md

@@ -41,6 +41,10 @@ The following startup hooks are put in place:
   * use binary packages according to environment variable `R_BINARY_PACKAGES`.
 * [/usr/local/bin/before-notebook.d/30-code-server.sh](base/scripts/usr/local/bin/before-notebook.d/30-code-server.sh)
   to update code-server settings.
+* [/usr/local/bin/before-notebook.d/50-rstudio.sh](base/scripts/usr/local/bin/before-notebook.d/50-rstudio.sh) to
+  * set environment variables in `$(R RHOME)/etc/Renviron.site`.
+  * put inital RStudio settings in place.
+  * create user's working folder.
 * [/usr/local/bin/before-notebook.d/70-qgis.sh](qgisprocess/scripts/usr/local/bin/before-notebook.d/70-qgis.sh) to
   * put inital QGIS settings in place.
   * copy plugin 'Processing Saga NextGen Provider'.
@@ -55,6 +59,8 @@ The following startup hooks are put in place:
     `NPROC_LIMIT`. (default: command `ulimit -u`)
   * limit the number of *pending signals* according to environment variable
     `SIGPEN_LIMIT`. (default: command `ulimit -i`)
+* [/usr/local/bin/before-notebook.d/95-misc.sh](base/scripts/usr/local/bin/before-notebook.d/95-misc.sh)
+  to export environment variables to `/tmp/environment`.
 
 ### Custom scripts
 

base/conf/shell/etc/profile.d/00-reset-path.sh

 # Reset default PATH settings
-if [ "$(id -u)" -eq 0 ]; then
+if [ "$(id -u)" -eq 0 ] || [ -n "$ZSH_VERSION" ]; then
   PATH="/opt/code-server/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin"
 else
   PATH="/opt/code-server/bin:/usr/local/bin:/usr/bin:/bin:/usr/local/games:/usr/games"

base/conf/shell/etc/zsh/zprofile

+# /etc/zsh/zprofile: system-wide .zprofile file for zsh(1).
+#
+# This file is sourced only for login shells (i.e. shells
+# invoked with "-" as the first character of argv[0], and
+# shells invoked with the -l flag.)
+#
+# Global Order: zshenv, zprofile, zshrc, zlogin
+
+. /etc/profile.d/00-reset-path.sh

base/scripts/usr/local/bin/before-notebook.d/95-misc.sh

+#!/bin/bash
+# Copyright (c) 2024 b-data GmbH.
+# Distributed under the terms of the MIT License.
+
+set -e
+
+# Export environment variables to /tmp/environment
+exclude_vars="HOME OLDPWD PWD SHLVL"
+for var in $(compgen -e); do
+  [[ ! $exclude_vars =~ $var ]] && echo "$var=${!var}" \
+    >> "/tmp/environment"
+done