Move everything to apps/desktop subdirectory

Some bits will need to be moved back out after the merge

Signed-off-by: Michael Telatynski <7t3chguy@gmail.com>

apps/desktop/dockerbuild/Dockerfile

@@ -0,0 +1,24 @@
+# Docker image to facilitate building Element Desktop's native bits using a glibc version (2.31)
+# with broader compatibility, down to Debian bullseye & Ubuntu focal.
+FROM rust:bullseye@sha256:16950191527a4cb9e0762d9d48b705a6315158e4035e64f7a93ce8656a1b053c
+
+ENV DEBIAN_FRONTEND=noninteractive
+
+RUN apt-get -qq update && apt-get -y -qq dist-upgrade && \
+  apt-get -y -qq install --no-install-recommends \
+  # tclsh is required for building SQLite as part of SQLCipher
+  tcl \
+  # Used by seshat (when not SQLCIPHER_STATIC) \
+  libsqlcipher-dev && \
+  apt-get purge -y --auto-remove && rm -rf /var/lib/apt/lists/*
+RUN ln -s /usr/bin/python3 /usr/bin/python & ln -s /usr/bin/pip3 /usr/bin/pip
+
+ENV DEBUG_COLORS=true
+ENV FORCE_COLOR=true
+
+WORKDIR /project
+
+ARG TARGETOS
+ARG TARGETARCH
+COPY .node-version dockerbuild/setup.sh /
+RUN /setup.sh

apps/desktop/dockerbuild/setup.sh

@@ -0,0 +1,12 @@
+#!/usr/bin/env bash
+
+set -x
+declare -A archMap=(["amd64"]="x64" ["arm64"]="arm64")
+ARCH="${archMap["$TARGETARCH"]}"
+# The .node-version file generally doesn't have the 'v' (renovate does not put the 'v' and will
+# strip it on upgrade if it's there) but the 'v' is also widely supported so we probably ought
+# to just work either way.
+NODE_VERSION=$(cat /.node-version | sed -e 's/^v//')
+curl --proto "=https" -L "https://nodejs.org/dist/v$NODE_VERSION/node-v$NODE_VERSION-$TARGETOS-$ARCH.tar.gz" | tar xz -C /usr/local --strip-components=1 && \
+  unlink /usr/local/CHANGELOG.md && unlink /usr/local/LICENSE && unlink /usr/local/README.md
+corepack enable