Keep trimming when pct fstrim fails on one container

pct fstrim exits 255 when the container is locked, for example while a
backup runs ("CT is locked (backup)"). Under errexit the command
substitution ended the whole run there, before the output check below it
and before the remaining containers, and telemetry filed it as
"DPKG: Fatal internal error". Print the result and go on instead.

tools/addon/homebrew.sh

@@ -42,7 +42,7 @@ require_debian_like
 function uninstall() {
   msg_info "Uninstalling Homebrew"
 
-  BREW_USER=$(awk -F: '$3 >= 1000 && $3 < 65534 && $7 !~ /(nologin|false)$/ { print $1; exit }' /etc/passwd)
+  BREW_USER=$(awk -F: '$3 >= 1000 && $3 < 65534 { print $1; exit }' /etc/passwd)
   if [[ -n "$BREW_USER" ]]; then
     BREW_USER_HOME=$(getent passwd "$BREW_USER" | cut -d: -f6)
     for rc_file in "$BREW_USER_HOME/.bashrc" "$BREW_USER_HOME/.profile"; do
@@ -64,7 +64,7 @@ function uninstall() {
 # ==============================================================================
 function install() {
   msg_info "Detecting Non-Root User"
-  BREW_USER=$(awk -F: '$3 >= 1000 && $3 < 65534 && $7 !~ /(nologin|false)$/ { print $1; exit }' /etc/passwd)
+  BREW_USER=$(awk -F: '$3 >= 1000 && $3 < 65534 { print $1; exit }' /etc/passwd)
   if [[ -z "$BREW_USER" ]]; then
     msg_warn "No non-root user found (uid >= 1000). Homebrew cannot run as root."
     read -r -p "${TAB}Create a 'brew' user automatically? (y/N): " create_user_prompt
@@ -81,7 +81,7 @@ function install() {
   msg_ok "Detected User: $BREW_USER"
 
   msg_info "Installing Dependencies"
-  apt_update_safe
+  $STD apt update
   $STD apt install -y build-essential git file procps
   msg_ok "Installed Dependencies"
 

tools/pve/fstrim.sh

@@ -118,7 +118,8 @@ function trim_container() {
   fi
 
   local fstrim_output
-  fstrim_output=$(pct fstrim "$container" 2>&1)
+  # pct fstrim fails on a locked CT (e.g. a running backup); report it and go on.
+  fstrim_output=$(pct fstrim "$container" 2>&1) || true
   if echo "$fstrim_output" | grep -qi "not supported"; then
     echo -e "${RD}fstrim isnt supported on this storage!${CL}"
   elif echo "$fstrim_output" | grep -Eq '([0-9]+(\.[0-9]+)?\s*[KMGT]?B)'; then