Update CONTRIBUTING.md

CONTRIBUTING.md

@@ -490,3 +490,30 @@ We have a few procedures we follow. These are documented here:
   
   </p>
   </details>
+
+### Set up a Docker Builder
+
+- amd64, armv7 using local.
+- arm64 using remote arm64 cpu, as the emulator is too slow and can no longer pass the `npm ci` command.
+
+1. Add the public key to the remote server.
+2. Add the remote context. The remote machine must be arm64 and installed Docker CE. 
+```
+docker context create oracle-arm64-jp --docker "host=ssh://root@100.107.174.88"
+```
+3. Create a new builder.
+```
+docker buildx create --name kuma-builder --platform linux/amd64,linux/arm/v7
+docker buildx use kuma-builder
+docker buildx inspect --bootstrap
+```
+4. Append the remote context to the builder.
+```
+docker buildx create --append --name kuma-builder --platform linux/arm64 oracle-arm64-jp
+```
+
+5. Verify the builder and check if the builder is using `kuma-builder`.
+```
+docker buildx inspect kuma-builder
+docker buildx ls
+```