ci: multi-arch deploy

Upload artifacts for the multi-arch images, then download, load them,
and deploy them along with multi-arch manifests after both finished
building.

.github/workflows/main.yml

@@ -126,7 +126,7 @@ jobs:
             }
           - {
               image: "android-arm64",
-              multiarch: "",
+              multiarch: "yes",
               stockfish: "yes",
               stockfish_arg: "ARCH=armv8 COMP=ndk",
               ninja: "no",
@@ -1469,8 +1469,85 @@ jobs:
           cd ..
           rm -rf libopencm3
 
-      - name: deploy
+      - name: archive ${{ matrix.arch_name.image }}-${{ matrix.os }}
+        if: matrix.arch_name.multiarch != 'yes'
+        run: |
+          mkdir -p cache-${{ matrix.arch_name.image }}-${{ env.HOST_ARCH }}
+            docker export dockcross/${{ matrix.arch_name.image }}:latest-${{ env.HOST_ARCH }} | xz -e9 -T0 > ./cache/${{ matrix.arch_name.image }}-${{ env.HOST_ARCH }}.tar.xz
+          fi
+
+      - name: save ${{ matrix.arch_name.image }}-${{ matrix.os }}
+        uses: actions/upload-artifact@v4
+        if: matrix.arch_name.multiarch != 'yes'
+        with:
+          name: cache-${{ matrix.arch_name.image }}-${{ env.HOST_ARCH }}
+          path: ./cache/${{ matrix.arch_name.image }}-${{ env.HOST_ARCH }}.tar.xz
+          retention-days: 3
+
+
+      - name: deploy-not-multi-arch
+        if: github.ref == 'refs/heads/master' && matrix.arch_name.multiarch != 'yes' && env.HOST_ARCH == 'amd64'
+        run: |
+            docker login -u ${{ secrets.DOCKER_USER }} -p ${{ secrets.DOCKER_PASS }}
+            make ${{ matrix.arch_name.image }}.push
+
+  deploy-multi-arch-images:
+    name: ${{ matrix.arch_name.image }}
+    needs: [${{ matrix.arch_name.image }}_on_ubuntu-22.04, ${{ matrix.arch_name.image }}_on_ubuntu-22.04-arm]
+    runs-on: ubuntu-22.04
+    strategy:
+      fail-fast: false
+      matrix:
+        arch_name:
+          - {
+              image: "android-arm64"
+            }
+          - {
+              image: "web-wasm",
+            }
+          - {
+              image: "web-wasi",
+            }
+          - {
+              image: "web-wasi-threads",
+            }
+
+      - name: checkout code
+        uses: actions/checkout@v4
+        with:
+          submodules: "recursive"
+          fetch-depth: 1
+
+      - name: set host_arch
+        run: |
+          echo "HOST_ARCH=$(uname -m | sed -e 's/x86_64/amd64/' -e 's/aarch64/arm64/')" >> $GITHUB_ENV
+
+      - name: download ${{ matrix.arch_name.image }}-amd64
+        uses: actions/download-artifact@v4
+        with:
+          name: cache-${{ matrix.arch_name.image }}-amd64
+          path: ./cache/${{ matrix.arch_name.image }}-amd64.tar.xz
+
+      - name: download ${{ matrix.arch_name.image }}-arm64
+        uses: actions/download-artifact@v4
+        with:
+          name: cache-${{ matrix.arch_name.image }}-arm64
+          path: ./cache/${{ matrix.arch_name.image }}-arm64.xz
+
+      - name: load images
+        run: |
+          xz -d -k < ./cache/${{ matrix.arch_name.image }}-amd64.tar.xz | docker import - dockcross/${{ matrix.arch_name.image }}-amd64
+          xz -d -k < ./cache/${{ matrix.arch_name.image }}-arm64.tar.xz | docker import - dockcross/${{ matrix.arch_name.image }}-arm64
+
+      - name: deploy-multi-arch
         if: github.ref == 'refs/heads/master'
         run: |
             docker login -u ${{ secrets.DOCKER_USER }} -p ${{ secrets.DOCKER_PASS }}
-            docker image push dockcross/${{ matrix.arch_name.image }} --all-tags
+
+            make ${{ matrix.arch_name.image }}.tag-amd64
+            make ${{ matrix.arch_name.image }}.tag-arm64
+
+            make ${{ matrix.arch_name.image }}.push-amd64
+            make ${{ matrix.arch_name.image }}.push-arm64
+
+            make ${{ matrix.arch_name.image }}.push

Makefile

@@ -363,6 +363,11 @@ $(addsuffix .test,$(MULTIARCH_IMAGES) web-wasi-threads): $$(basename $$@)
 		&& chmod +x $(BIN)/dockcross-$(basename $@)
 	$(BIN)/dockcross-$(basename $@) -i $(ORG)/$(basename $@):latest-$(HOST_ARCH) python3 test/run.py $($@_ARGS)
 
+.SECONDEXPANSION:
+$(addsuffix .tag-$(HOST_ARCH),$(MULTIARCH_IMAGES) web-wasi-threads web-wasm): $$(basename $$@)
+	$(BUILD_DOCKER) tag $(ORG)/$(basename $@):latest-$(HOST_ARCH) \
+		 $(ORG)/$(basename $@):$(TAG)-$(HOST_ARCH)
+
 .SECONDEXPANSION:
 $(addsuffix .push-$(HOST_ARCH),$(MULTIARCH_IMAGES) web-wasi-threads web-wasm): $$(basename $$@)
 	$(BUILD_DOCKER) push $(ORG)/$(basename $@):latest-$(HOST_ARCH) \