Add arm64 support. (redis#8)

Author: yossigo

.github/workflows/unstable.yml

@@ -14,12 +14,28 @@ jobs:
       with:
         repository: redis/redis
         path: redis
+    - name: Prepare for cross-compilation
+      run: |
+          sudo dpkg --add-architecture arm64
+          sudo sed -i 's/^deb /deb [arch=amd64] /g' /etc/apt/sources.list
+          cat <<_END_ | sudo tee /etc/apt/sources.list.d/crosscompile.list
+          deb [arch=arm64] http://ports.ubuntu.com $(lsb_release -cs) main universe
+          deb [arch=arm64] http://ports.ubuntu.com $(lsb_release -cs)-updates main universe
+          _END_
     - name: Setup Snapcraft
       run: |
-          sudo snap install snapcraft --classic
-          echo "$SNAP_TOKEN" | snapcraft login --with -
-          snapcraft
-          snapcraft upload --release=edge *.snap
+        sudo snap install snapcraft --classic
+        echo "$SNAP_TOKEN" | snapcraft login --with -
       env:
         SNAP_TOKEN: ${{secrets.SNAP_TOKEN}}
+    - name: Build amd64
+      env:
         SNAPCRAFT_BUILD_ENVIRONMENT: host
+      run: snapcraft --target-arch amd64 --destructive-mode --enable-experimental-target-arch
+    - name: Build arm64
+      env:
+        SNAPCRAFT_BUILD_ENVIRONMENT: host
+      run: snapcraft --target-arch arm64 --destructive-mode --enable-experimental-target-arch
+    - name: Upload
+      run: |
+          snapcraft upload --release=edge *.snap

snap/snapcraft.yaml

@@ -64,6 +64,8 @@ parts:
     source: redis/
     override-build: |
       mkdir -p ${SNAPCRAFT_PART_INSTALL}/usr
+      export CC=${SNAPCRAFT_ARCH_TRIPLET}-gcc
+      export DEB_HOST_GNU_TYPE=${SNAPCRAFT_ARCH_TRIPLET}
       make -j4 BUILD_TLS=yes
       PREFIX=${SNAPCRAFT_PART_INSTALL}/usr make BUILD_TLS=yes install
       VER=`sed -n 's/^.* REDIS_VERSION "\(.*\)"$/\1/g p' < src/version.h`
@@ -73,7 +75,8 @@ parts:
       fi
       snapcraftctl set-version $VER
     build-packages:
-      - build-essential
-      - pkg-config
-      - libssl-dev
-      - gcc
+      - on amd64:
+        - to arm64:
+          - libssl-dev:arm64
+        - to amd64:
+          - libssl-dev