build: fix auto-completion scripts and include them in .deb package (#25195)

Co-authored-by: Felix Lange <fjl@twurst.com>

build/deb/ethereum/completions/bash_autocomplete

-#! /bin/bash
-
-: ${PROG:=$(basename ${BASH_SOURCE})}
-
-_cli_bash_autocomplete() {
+_geth_bash_autocomplete() {
   if [[ "${COMP_WORDS[0]}" != "source" ]]; then
     local cur opts base
     COMPREPLY=()
@@ -17,5 +13,4 @@ _cli_bash_autocomplete() {
   fi
 }
 
-complete -o bashdefault -o default -o nospace -F _cli_bash_autocomplete $PROG
-unset PROG
+complete -o bashdefault -o default -o nospace -F _geth_bash_autocomplete geth

build/deb/ethereum/completions/zsh_autocomplete

-#compdef $PROG
-
-_cli_zsh_autocomplete() {
+_geth_zsh_autocomplete() {
   local -a opts
   local cur
   cur=${words[-1]}
@@ -17,4 +15,4 @@ _cli_zsh_autocomplete() {
   fi
 }
 
-compdef _cli_zsh_autocomplete $PROG
+compdef _geth_zsh_autocomplete geth

build/deb/ethereum/deb.install

 build/bin/{{.BinaryName}} usr/bin
+{{- if eq .BinaryName "geth" }}
+build/deb/ethereum/completions/bash_autocomplete etc/bash_completion.d/geth
+build/deb/ethereum/completions/zsh_autocomplete usr/share/zsh/vendor-completions/_geth
+{{end -}}