feat: added script to automatically update with github actions

Co-authored-by: omarcresp <crespomerchano@gmail.com>

.github/new-version.sh

@@ -0,0 +1,10 @@
+#!/bin/sh
+
+upstream=$(curl -s https://api.github.com/repos/zen-browser/desktop/releases/latest | jq -r '.tag_name')
+local=$(grep -oP 'version = "\K[^"]+' flake.nix)
+
+if [ "$upstream" != "$local" ]; then
+    echo "new_version=true" >>"$GITHUB_OUTPUT"
+fi
+
+echo "$upstream"

.github/update-zen-browser.bash

@@ -0,0 +1,23 @@
+#!/usr/bin/env bash
+
+script_dir="$(dirname -- "$0")"
+
+upstream=$("$script_dir/new-version.sh" | cat -)
+
+echo "Updating to $upstream"
+
+base_url="https://github.com/zen-browser/desktop/releases/download/$upstream"
+
+# Modify with sed the nix file
+sed -i "s/version = \".*\"/version = \"$upstream\"/" ./flake.nix
+
+# Update the hash specific.sha256
+specific=$(nix-prefetch-url --type sha256 --unpack "$base_url/zen.linux-specific.tar.bz2")
+sed -i "s/specific.sha256 = \".*\"/specific.sha256 = \"$specific\"/" ./flake.nix
+
+# Update the hash generic.sha256
+generic=$(nix-prefetch-url --type sha256 --unpack "$base_url/zen.linux-generic.tar.bz2")
+sed -i "s/generic.sha256 = \".*\"/generic.sha256 = \"$generic\"/" ./flake.nix
+
+nix flake update
+nix build

.github/workflows/zen-update.yml

@@ -0,0 +1,41 @@
+name: Update Zen Browser
+
+on:
+  workflow_dispatch:
+  schedule:
+    - cron: "0 * * * *"
+
+jobs:
+  update-zen-browser:
+    name: Update Zen Browser
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+
+      - name: Check new version
+        id: new-version
+        run: |
+          .github/new-version.sh
+
+      - name: Install Nix
+        if: steps.new-version.outputs.new_version == 'true'
+        uses: cachix/install-nix-action@v27
+        with:
+          nix_path: nixpkgs=channel:nixpkgs-unstable
+
+      - name: Setup Nix Magic Cache
+        if: steps.new-version.outputs.new_version == 'true'
+        uses: DeterminateSystems/magic-nix-cache-action@main
+
+      - name: Update hashes and test build
+        if: steps.new-version.outputs.new_version == 'true'
+        run: |
+          .github/update-zen-browser.bash
+
+      - name: Commit changes
+        if: steps.new-version.outputs.new_version == 'true'
+        uses: stefanzweifel/git-auto-commit-action@v5
+        with:
+          commit_message: "GitHub Action automated Zen update"
+          file_pattern: "*"