epm play: add signal messenger support (thanks, george@)

play.d/signal.sh

+#!/bin/sh
+
+PKGNAME=signal-desktop
+SUPPORTEDARCHES="x86_64"
+DESCRIPTION='Signal private messenger from the official site'
+DOWNURL="https://updates.signal.org/desktop/apt/pool/main/s/signal-desktop"
+
+. $(dirname $0)/common.sh
+
+URL=$(epm tool eget --list --latest http://mirror.cs.uchicago.edu/signal/pool/main/s/signal-desktop/ '*.amd64.deb')
+URL=$(echo "$URL" | sed -e "s|\(.*/\)|$DOWNURL/|")
+epm install "$URL"

repack.d/signal-desktop.sh

+#!/bin/sh -x
+
+# It will be run with two args: buildroot spec
+BUILDROOT="$1"
+SPEC="$2"
+
+PRODUCT=signal-desktop
+PRODUCTCUR=Signal
+PRODUCTDIR=/opt/$PRODUCTCUR
+
+. $(dirname $0)/common-chromium-browser.sh
+
+install_deps
+
+subst '1iAutoProv:no' $SPEC
+
+subst "s|.*/etc/apt.*||" $SPEC
+subst '/linux-arm64/d' $SPEC
+rm -rf $BUILDROOT/opt/Signal/resources/app.asar.unpacked/node_modules/ffi-napi/node_modules/ref-napi/prebuilds/linux-arm64
+
+fix_chrome_sandbox
+
+add_bin_link_command