alpine: add nodejs & build multi-arch #4380
                
     Merged
            
            
          
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This PR is a preparation step for adding support for
linux-musl-arm64:linux-musl-arm64#4365This makes sentry-dotnet-alpine a multi-arch Docker image that supports both x64 and arm64 architectures. This is done by replacing manual
dockercommands with Docker's official setup-qemu-action and setup-buildx-action to addlinux/arm64alongside the existinglinux/amd64architecture. Furthermore, Node.js is installed for executing JS actions such asactions/checkout.#skip-changelog