Update reproducible build script to reflect build process

reproducible-builds/docker-entrypoint.sh

@@ -0,0 +1,60 @@
+#!/usr/bin/env bash
+# Copyright 2024 Signal Messenger, LLC
+# SPDX-License-Identifier: AGPL-3.0-only
+
+trap '[[ $pid ]] && kill $pid; exit' EXIT
+
+# This is the default entrypoint for the when running the build container.
+# Usage: docker-entrypoint.sh [BUILD_TYPE]
+
+# BUILD_TYPE affects the package name and version.
+# dev (default):
+# - name: signal-desktop
+# - version: package.json version
+# public:
+# - name: signal-desktop or signal-desktop-beta, depending on package.json version
+# - version: package.json version
+# alpha:
+# - name: signal-desktop-alpha
+# - version: package.json version + commit sha
+# test: Same as alpha
+# staging:
+# - name: signal-desktop-staging
+# - version: package.json version + commit sha; replaces "alpha" with "staging"
+if [ "$1" != "" ]; then
+  BUILD_TYPE="$1"
+fi
+echo "BUILD_TYPE: ${BUILD_TYPE}"
+
+# SOURCE_DATE_EPOCH allows package builders like FPM (used for creating the .deb
+# package on linux) to make their build timestamps determistic. Otherwise, a fresh
+# UNIX timestamp will be generated at the time of the build, and is non-deterministic.
+echo "SOURCE_DATE_EPOCH: ${SOURCE_DATE_EPOCH}"
+
+npm install
+npm run clean-transpile
+cd sticker-creator
+npm install
+npm run build
+cd ..
+npm run generate
+
+if [ "${BUILD_TYPE}" = "public" ]; then
+  npm run prepare-beta-build
+elif [ "${BUILD_TYPE}" = "alpha" ]; then
+  npm run prepare-alpha-version
+  npm run prepare-alpha-build
+elif [ "${BUILD_TYPE}" = "staging" ]; then
+  npm run prepare-alpha-version
+  npm run prepare-staging-build
+elif [ "${BUILD_TYPE}" = "test" ]; then
+  npm run prepare-alpha-version
+  npm run prepare-alpha-build
+elif [ "${BUILD_TYPE}" = "dev" ]; then
+  echo "dev build, using package.json as is"
+else
+  echo "Unknown build type ${BUILD_TYPE}"
+  exit 1
+fi
+
+npm run build-linux