support for linux-arm64 github actions

.github/workflows/cia-unix-build.yml

@@ -11,33 +11,48 @@ jobs:
     strategy:
       matrix:
         include:
-        # Linux x86-64
+          # Linux x86-64
           - os: ubuntu-latest
             artifact_name: ${{ github.event.repository.name }}
             asset_name: ${{ github.event.repository.name }}-linux-x86_64
-        # Linux arm64
+          # Linux arm64
           - os: ubuntu-22.04-arm
             artifact_name: ${{ github.event.repository.name }}
             asset_name: ${{ github.event.repository.name }}-linux-arm64
-        # macOS x86-64
+          # macOS x86-64
           - os: macos-13
             artifact_name: ${{ github.event.repository.name }}
             asset_name: ${{ github.event.repository.name }}-macos-x86_64
-        # macOS arm64
+          # macOS arm64
           - os: macos-latest
             artifact_name: ${{ github.event.repository.name }}
             asset_name: ${{ github.event.repository.name }}-macos-arm64
+
     runs-on: ${{ matrix.os }}
     steps:
-    - name: Install crystal
-      uses: crystal-lang/install-crystal@v1
-    - uses: actions/checkout@v4
-    - name: Build release
-      run: |
-        crystal build ${{ matrix.artifact_name }}.cr --release --no-debug
-        strip ${{ matrix.artifact_name }}
-    - name: Upload artifacts
-      uses: actions/upload-artifact@v4.3.3
-      with:
-        name: ${{ matrix.asset_name }}
-        path: ${{ matrix.artifact_name}}
+      - uses: actions/checkout@v4
+      
+      - name: Install Crystal for linux-arm64
+        if: matrix.os == 'ubuntu-22.04-arm'
+        run: |
+          curl -fsSL https://packagecloud.io/84codes/crystal/gpgkey | gpg --dearmor | sudo tee /etc/apt/trusted.gpg.d/84codes_crystal.gpg > /dev/null
+          . /etc/os-release
+          echo "deb https://packagecloud.io/84codes/crystal/$ID $VERSION_CODENAME main" | sudo tee /etc/apt/sources.list.d/84codes_crystal.list
+          sudo apt-get update
+          sudo apt-get install crystal
+
+      - name: Install Crystal for linux-x86_64 and macOS
+        if: matrix.os != 'ubuntu-22.04-arm'
+        uses: crystal-lang/install-crystal@v1
+
+      - name: Build release
+        run: |
+          crystal build ${{ matrix.artifact_name }}.cr --release --no-debug
+          strip ${{ matrix.artifact_name }}
+
+      - name: Upload artifacts
+        uses: actions/upload-artifact@v4.3.3
+        with:
+          name: ${{ matrix.asset_name }}
+          path: ${{ matrix.artifact_name }}
+