Let's try

build.sh

@@ -0,0 +1,36 @@
+#!/bin/sh
+
+set -e
+
+apt-get update
+
+apt-get -q -y -o Dpkg::Use-Pty=0 install curl jq
+
+REPO_NAME=deltachat/deltachat-desktop
+TAG_NAME=$(curl --silent --fail --show-error "https://api.github.com/repos/$REPO_NAME/releases/latest" | jq -r .tag_name)
+
+GET_SRC_MODE="tar"
+SRC_DIR_PATH="./"
+
+if [ $GET_SRC_MODE = "github-tar" ]; then
+    mkdir tmp_extract
+    curl --silent --fail -L "https://api.github.com/repos/${REPO_NAME}/tarball/${TAG_NAME}" -o - | tar xvz -f - -C "$SRC_DIR_PATH" || rm -rf tmp_extract && exit 1
+    mv tmp_extract/* ../src
+else
+    if [ $GET_SRC_MODE = "github" ]
+        git clone "https://github.com/${REPO_NAME}.git" src
+        cd src
+        git checkout "${TAG_NAME}"
+        cd ..
+    else
+        echo "Not valid mode"
+        exit 1
+    fi
+fi
+
+apt-get -q -y -o Dpkg::Use-Pty=0 --no-install-recommends install npm cargo
+
+npm install --no-audit
+NODE_ENV=production npm run build
+NO_ASAR=true npm run pack:generate_config
+npm run pack:linux