Arma 3 Image Cleanup & Refurbishment

Files:
- Remove dependency of having `libnss_wrapper.so` libraries directly in the image. Instead, use the libraries provided with their respective packages. This fixes the current 32-bit version being broken and ensures the libraries stay up to date with their respective packages.
- Slight change to passwd.template to accommodate variable name change.

Dockerfile:
- Change the base image to Debian, which from testing appears to run cleaner and faster for Arma. It also should yield a smaller image.
- Fix depreciated `ENV` call format.
- Removed un-needed packages.
- Added iproute2 package.
- Consolidated the NSS Wrapper setup to a commented group of lines to make understanding it's purpose and setup more clear.
- Added shell flag to `useradd` command.

Entrypoint:
- General cleanup.
- Changed `LD_PRELOAD`s to point to package-provided library file locations.

games/arma3/Dockerfile

@@ -1,29 +1,51 @@
-FROM        ubuntu:20.04
+FROM        --platform=$BUILDPLATFORM debian:stable-slim
 
 LABEL       author="David Wolfe (Red-Thirten)" maintainer="rehlmgaming@gmail.com"
-ENV         DEBIAN_FRONTEND noninteractive
-ENV         USER_NAME container
-ENV         NSS_WRAPPER_PASSWD /tmp/passwd 
-ENV         NSS_WRAPPER_GROUP /tmp/group
 
-# Install Dependencies
+LABEL       org.opencontainers.image.source="https://github.com/parkervcp/yolks"
+LABEL       org.opencontainers.image.licenses=MIT
+
+## Update base packages and install dependencies
+ENV         DEBIAN_FRONTEND=noninteractive
 RUN         dpkg --add-architecture i386 \
             && apt-get update \
             && apt-get upgrade -y \
-            && apt-get install -y libgcc-10-dev libstdc++-10-dev libtinfo5 lib64z1 libcurl3-gnutls \
-            && apt-get install -y libnss-wrapper gettext-base tar curl gcc g++ libc6 libtbb2 lib32z1 lib32gcc1 lib32stdc++6 libsdl2-2.0-0 libsdl2-2.0-0:i386 libtbb2:i386 lib32stdc++6 libtinfo5:i386 libncurses5:i386 libcurl3-gnutls:i386 tzdata \
-            && useradd -m -d /home/container -s /bin/bash container \
-            && touch ${NSS_WRAPPER_PASSWD} ${NSS_WRAPPER_GROUP} \
+            && apt-get install -y \
+                curl \
+                tzdata \
+                locales \
+                iproute2 \
+                gettext-base \
+                ca-certificates \
+                libssl-dev \
+                lib32gcc-s1 \
+                libsdl2-2.0-0 \
+                libsdl2-2.0-0:i386 \
+                libstdc++6 \
+                libstdc++6:i386 \
+                lib32stdc++6 \
+                libnss-wrapper \
+                libnss-wrapper:i386 \
+                libtbb2 \
+                libtbb2:i386
+
+## Configure locale
+RUN         update-locale lang=en_US.UTF-8 \
+            && dpkg-reconfigure --frontend noninteractive locales
+
+## Prepare NSS Wrapper for the entrypoint as a workaround for Arma 3 requiring a valid UID
+ENV         NSS_WRAPPER_PASSWD=/tmp/passwd NSS_WRAPPER_GROUP=/tmp/group
+RUN         touch ${NSS_WRAPPER_PASSWD} ${NSS_WRAPPER_GROUP} \
             && chgrp 0 ${NSS_WRAPPER_PASSWD} ${NSS_WRAPPER_GROUP} \
             && chmod g+rw ${NSS_WRAPPER_PASSWD} ${NSS_WRAPPER_GROUP}
-
 ADD         passwd.template /passwd.template
 
+## Setup user and working directory
+RUN         useradd -m -d /home/container -s /bin/bash container
 USER        container
-ENV         HOME /home/container
+ENV         USER=container HOME=/home/container
 WORKDIR     /home/container
 
-COPY        ./libnss_wrapper.so /libnss_wrapper.so
-COPY        ./libnss_wrapper_x64.so /libnss_wrapper_x64.so
+## Copy over and execute entrypoint.sh
 COPY        ./entrypoint.sh /entrypoint.sh
-CMD         ["/bin/bash", "/entrypoint.sh"]
+CMD         [ "/bin/bash", "/entrypoint.sh" ]