ci: simplify arch package build to x86_64 only

- Remove cross-compilation matrix for arch packages
- Remove cross and related configuration
- Update dependencies to use systemd-libs
- Simplify build steps for native x86_64 only
- Update cache keys and artifact names for x86_64

.github/workflows/release.yml

@@ -140,20 +140,6 @@ jobs:
     name: Build Arch Package
     needs: check
     runs-on: ubuntu-latest
-    strategy:
-      matrix:
-        target:
-          - x86_64-unknown-linux-gnu
-          - aarch64-unknown-linux-gnu
-          - armv7-unknown-linux-gnueabihf
-        include:
-          - target: x86_64-unknown-linux-gnu
-            arch: x86_64
-          - target: aarch64-unknown-linux-gnu
-            arch: aarch64
-          - target: armv7-unknown-linux-gnueabihf
-            arch: armv7h
-
     container:
       image: archlinux:base-devel
       options: --privileged
@@ -172,21 +158,18 @@ jobs:
             rustup \
             cargo \
             pkg-config \
-            libudev \
-            systemd
+            systemd \
+            systemd-libs
 
       - name: Setup Rust
         run: |
           rustup default stable
-          rustup target add ${{ matrix.target }}
+          rustup target add x86_64-unknown-linux-gnu
 
       - name: Install Rust toolchain
         uses: dtolnay/rust-toolchain@stable
         with:
-          targets: ${{ matrix.target }}
-
-      - name: Install cross
-        uses: taiki-e/install-action@cross
+          targets: x86_64-unknown-linux-gnu
 
       - name: Cache cargo
         uses: actions/cache@v3
@@ -195,28 +178,12 @@ jobs:
             ~/.cargo/registry
             ~/.cargo/git
             target
-          key: ${{ runner.os }}-arch-cargo-${{ matrix.target }}-${{ hashFiles('**/Cargo.lock') }}
+          key: ${{ runner.os }}-arch-cargo-x86_64-${{ hashFiles('**/Cargo.lock') }}
           restore-keys: |
-            ${{ runner.os }}-arch-cargo-${{ matrix.target }}-
-
-      - name: Cache cross
-        if: matrix.target != 'x86_64-unknown-linux-gnu'
-        uses: actions/cache@v3
-        with:
-          path: ~/.cargo/.cross
-          key: ${{ runner.os }}-arch-cross-${{ matrix.target }}-${{ hashFiles('Cross.arch.toml') }}
-          restore-keys: |
-            ${{ runner.os }}-arch-cross-${{ matrix.target }}-
+            ${{ runner.os }}-arch-cargo-x86_64-
 
       - name: Build
-        env:
-          CROSS_CONFIG: Cross.arch.toml
-        run: |
-          if [ "${{ matrix.target }}" = "x86_64-unknown-linux-gnu" ]; then
-            cargo build --release --target ${{ matrix.target }}
-          else
-            cross build --release --target ${{ matrix.target }}
-          fi
+        run: cargo build --release --target x86_64-unknown-linux-gnu
 
       - name: Prepare PKGBUILD
         run: |
@@ -233,12 +200,12 @@ jobs:
           cd pkg
           mv ../modbus-relay.tar.gz .
           cp /tmp/modbus-relay/dist/arch/PKGBUILD .
-          CARCH=${{ matrix.arch }} makepkg -s --noconfirm
+          CARCH=x86_64 makepkg -s --noconfirm
 
       - name: Upload artifacts
         uses: actions/upload-artifact@v4
         with:
-          name: pkg-${{ matrix.arch }}
+          name: pkg-x86_64
           path: /tmp/pkg/*.pkg.tar.zst
 
   create-release: