Remove Arch Linux packaging from release scripts

.github/workflows/check-arch-package.yaml

@@ -1,53 +0,0 @@
-on:
-  pull_request:
-    paths:
-      - "arch/**"
-  push:
-    paths:
-      - "arch/**"
-  workflow_dispatch:
-
-env:
-  FORCE_JAVASCRIPT_ACTIONS_TO_NODE24: true
-
-jobs:
-  build-arch:
-    runs-on: ubuntu-latest
-    container:
-      image: archlinux:base-devel
-      options: --user root
-
-    steps:
-      - name: Install pre-requisites
-        run: pacman -Sy --noconfirm git radicle
-
-      - uses: actions/checkout@v6
-
-      - name: Set up builder user
-        run: |
-          useradd -m builder
-          echo 'builder ALL=(ALL) NOPASSWD: ALL' > /etc/sudoers.d/builder
-          chown -R builder:builder "$GITHUB_WORKSPACE"
-
-      - name: Cache cargo registry
-        uses: actions/cache@v5
-        with:
-          path: /home/builder/.cargo/registry
-          key: arch-cargo-${{ hashFiles('arch/radicle-desktop/PKGBUILD') }}
-          restore-keys: arch-cargo-
-
-      - name: Check .SRCINFO is up-to-date
-        run: |
-          cd arch/radicle-desktop
-          sudo -u builder makepkg --printsrcinfo > .SRCINFO
-          sudo -u builder git -C "$GITHUB_WORKSPACE" diff --exit-code arch/radicle-desktop/.SRCINFO
-
-      - name: Build package
-        run: |
-          sudo -u builder env \
-            CI=true \
-            BUILDDIR=/home/builder/build \
-            PKGDEST=/home/builder \
-            SRCDEST=/home/builder \
-            makepkg --dir "$GITHUB_WORKSPACE/arch/radicle-desktop" \
-              --syncdeps --noconfirm --force