Install direnv with chezmoiexternal

As now direnv/direnv#845 was merged and we
finally have first-class support for .env files. The move to
chezmoiexternal was due to 2 things: because I want the new version fast
and because I make it indenpendent of the OS, allowing it to be used on
devcontainers as well.

home/.chezmoiexternal.yaml

@@ -34,6 +34,11 @@
   stripComponents: 1
   exact: true
 
+".local/bin/direnv":
+  type: file
+  url: "https://github.com/direnv/direnv/releases/download/v{{ template "get-github-latest-version" list "direnv/direnv" $cache }}/direnv.linux-{{ .chezmoi.arch }}"
+  executable: true
+
 {{ if not .is_devcontainer -}}
 {{   if .is_gnome -}}
 ".local/share/nautilus-python/extensions/code-nautilus.py":

root/.chezmoiscripts/run_after_10-install-apt-packages.sh.tmpl

@@ -6,7 +6,6 @@
 true || source ../.chezmoitemplates/scripts-library
 
 readonly wanted_packages=(
-  direnv
   apt-transport-https
   ca-certificates
   gnupg

root/.chezmoiscripts/run_before_20-uninstall-apt-packages.sh.tmpl

@@ -7,6 +7,7 @@ true || source ../.chezmoitemplates/scripts-library
 
 readonly unwanted_packages=(
   gcmcore
+  direnv
 )
 
 for package in "${unwanted_packages[@]}"; do