diff --git a/.github/workflows/ghcr_arm.yml b/.github/workflows/ghcr_arm.yml
index 26ee5eb2..983647aa 100644
--- a/.github/workflows/ghcr_arm.yml
+++ b/.github/workflows/ghcr_arm.yml
@@ -11,7 +11,7 @@ jobs:
     with:
       flavor: arm
       platforms: linux/arm64
-      dockerfile: Dockerfile.arm
+      dockerfile: Dockerfile
 
   build-apps:
     uses: ./.github/workflows/image_app.yml
diff --git a/build b/build
index 094c5bbf..c19f562a 100755
--- a/build
+++ b/build
@@ -286,7 +286,11 @@ prompt "Are you sure you want to build $BASE_IMAGE?"
 if [ -z "$FLAVOR" ]; then
   export RUNTIME_DOCKERFILE="Dockerfile"
 else
-  export RUNTIME_DOCKERFILE="Dockerfile.$FLAVOR"
+  if [ -f "runtime/Dockerfile.$FLAVOR" ]; then
+    export RUNTIME_DOCKERFILE="Dockerfile.$FLAVOR"
+  else
+    export RUNTIME_DOCKERFILE="Dockerfile"
+  fi
 fi
 
 log "Building base image: $BASE_IMAGE"
diff --git a/runtime/Dockerfile.arm b/runtime/Dockerfile.arm
deleted file mode 100644
index bd3b6953..00000000
--- a/runtime/Dockerfile.arm
+++ /dev/null
@@ -1,108 +0,0 @@
-ARG BASE_IMAGE=debian:bullseye-slim
-FROM $BASE_IMAGE AS runtime
-
-#
-# set custom user
-ARG USERNAME=neko
-ARG USER_UID=1000
-ARG USER_GID=$USER_UID
-
-#
-# install dependencies
-ENV DEBIAN_FRONTEND=noninteractive
-RUN set -eux; \
-    apt-get update; \
-    apt-get install -y --no-install-recommends \
-        wget ca-certificates supervisor python2 \
-        pulseaudio dbus-x11 xserver-xorg-video-dummy \
-        libcairo2 libxcb1 libxrandr2 libxv1 libopus0 libvpx6 \
-        #
-        # needed for profile upload preStop hook
-        zip curl \
-        #
-        # file chooser handler, clipboard, drop
-        xdotool xclip libgtk-3-0 \
-        #
-        # gst
-        gstreamer1.0-plugins-base gstreamer1.0-plugins-good \
-        gstreamer1.0-plugins-bad gstreamer1.0-plugins-ugly \
-        gstreamer1.0-pulseaudio gstreamer1.0-omx; \
-    # install libxcvt0 (not available in debian:bullseye)
-    wget http://ftp.de.debian.org/debian/pool/main/libx/libxcvt/libxcvt0_0.1.2-1_armhf.deb; \
-    apt-get install  --no-install-recommends ./libxcvt0_0.1.2-1_armhf.deb; \
-    rm ./libxcvt0_0.1.2-1_armhf.deb; \
-    #
-    # create a non-root user
-    groupadd --gid $USER_GID $USERNAME; \
-    useradd --uid $USER_UID --gid $USERNAME --shell /bin/bash --create-home $USERNAME; \
-    adduser $USERNAME audio; \
-    adduser $USERNAME video; \
-    adduser $USERNAME pulse; \
-    #
-    # workaround for an X11 problem: http://blog.tigerteufel.de/?p=476
-    mkdir /tmp/.X11-unix; \
-    chmod 1777 /tmp/.X11-unix; \
-    chown $USERNAME /tmp/.X11-unix/; \
-    #
-    # make directories for neko
-    mkdir -p /etc/neko /var/www /var/log/neko \
-        /tmp/runtime-$USERNAME \
-        /home/$USERNAME/.config/pulse  \
-        /home/$USERNAME/.local/share/xorg; \
-    chmod 1777 /var/log/neko; \
-    chown $USERNAME /var/log/neko/ /tmp/runtime-$USERNAME; \
-    chown -R $USERNAME:$USERNAME /home/$USERNAME; \
-    #
-    # install fonts
-    apt-get install -y --no-install-recommends \
-        # Emojis
-        fonts-noto-color-emoji \
-        # Chinese fonts
-        fonts-arphic-ukai fonts-arphic-uming \
-        fonts-wqy-zenhei xfonts-intl-chinese xfonts-wqy \
-        # Japanese fonts
-        fonts-ipafont-mincho fonts-ipafont-gothic \
-        fonts-takao-mincho \
-        # Korean fonts
-        fonts-unfonts-core \
-        fonts-wqy-microhei \
-        # Indian fonts
-        fonts-indic; \
-    #
-    # clean up
-    apt-get clean -y; \
-    rm -rf /var/lib/apt/lists/* /var/cache/apt/*
-
-#
-# copy runtime configs
-COPY --chown=neko:neko .Xresources /home/$USERNAME/.Xresources
-COPY dbus /usr/bin/dbus
-COPY default.pa /etc/pulse/default.pa
-COPY supervisord.conf /etc/neko/supervisord.conf
-COPY supervisord.dbus.conf /etc/neko/supervisord.dbus.conf
-COPY xorg.conf /etc/neko/xorg.conf
-
-#
-# copy runtime folders
-COPY --chown=neko:neko icon-theme /home/$USERNAME/.icons/default
-COPY fontconfig/* /etc/fonts/conf.d/
-COPY fonts /usr/local/share/fonts
-
-#
-# set default envs
-ENV USER=$USERNAME
-ENV DISPLAY=:99.0
-ENV PULSE_SERVER=unix:/tmp/pulseaudio.socket
-ENV XDG_RUNTIME_DIR=/tmp/runtime-$USERNAME
-ENV NEKO_SERVER_BIND=:8080
-ENV NEKO_PLUGINS_ENABLED=true
-ENV NEKO_PLUGINS_DIR=/etc/neko/plugins/
-
-#
-# add healthcheck
-HEALTHCHECK --interval=10s --timeout=5s --retries=8 \
-    CMD wget -O - http://localhost:${NEKO_SERVER_BIND#*:}/health || exit 1
-
-#
-# run neko
-CMD ["/usr/bin/supervisord", "-c", "/etc/neko/supervisord.conf"]