ci: migrate docker build to multi-machine multi-arch matrix

.gitea/workflows/build.yml

@@ -87,7 +87,7 @@ jobs:
           touch "/tmp/digests/${digest#sha256:}"
 
       - name: Upload digest
-        uses: https://github.com/christopherHX/gitea-upload-artifact@v4
+        uses: actions/upload-artifact@v7
         with:
           name: digests-linux-amd64
           path: /tmp/digests/*
@@ -153,7 +153,7 @@ jobs:
           touch "/tmp/digests/${digest#sha256:}"
 
       - name: Upload digest
-        uses: https://github.com/christopherHX/gitea-upload-artifact@v4
+        uses: actions/upload-artifact@v7
         with:
           name: digests-linux-arm64
           path: /tmp/digests/*
@@ -166,7 +166,7 @@ jobs:
     needs: [build-amd64, build-arm64]
     steps:
       - name: Download all digests
-        uses: https://github.com/christopherHX/gitea-download-artifact@v4
+        uses: actions/download-artifact@v8.0.1
         with:
           path: /tmp/digests
           pattern: digests-*