fix(docker): add TERM environment variable to all Dockerfiles for consistency

Dockerfile.arch

@@ -1,5 +1,7 @@
 FROM archlinux
 
+ENV TERM=xterm
+
 RUN pacman -Syu --noconfirm
 RUN pacman -S --needed --noconfirm reflector && reflector --latest 20 --protocol https --sort rate --save /etc/pacman.d/mirrorlist 
 RUN pacman-key --init

Dockerfile.debian

@@ -1,6 +1,9 @@
 # Build the latest Debian testing image
 FROM debian:testing
 
+ENV DEBIAN_FRONTEND="noninteractive"
+ENV TERM=xterm
+
 RUN apt-get update && apt-get install -y --no-install-recommends \
   autoconf \
   autoconf-archive \

Dockerfile.fedora

@@ -42,6 +42,7 @@ RUN dnf install -y \
 ENV LANG en_US.UTF-8
 ENV LANGUAGE en_US:en
 ENV LC_ALL en_US.UTF-8
+ENV TERM=xterm
 
 RUN mkdir -p /usr/src
 WORKDIR /usr/src

Dockerfile.tumbleweed

@@ -41,6 +41,7 @@ RUN zypper --non-interactive in --no-recommends \
 ENV LANG en_US.UTF-8
 ENV LANGUAGE en_US:en
 ENV LC_ALL en_US.UTF-8
+ENV TERM=xterm
 
 RUN mkdir -p /usr/src
 WORKDIR /usr/src

Dockerfile.ubuntu

@@ -1,6 +1,7 @@
 FROM ubuntu:latest
 
 ENV DEBIAN_FRONTEND="noninteractive"
+ENV TERM=xterm
 
 RUN apt-get update && apt-get install -y --no-install-recommends \
   autoconf \