add arm instructions

Author: calebdoxsey

README.md

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+# Envoy Binaries

arm.md

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+# ARM64
+
+This guide explains how to build envoy for arm64.
+
+1. Create an AWS arm64 instance (ie `m6g.medium`). Make sure the root device is at least 20GB in size.
+2. Install docker:
+
+   ```bash
+   curl -fsSL https://get.docker.com -o get-docker.sh
+   sudo sh get-docker.sh
+   sudo usermod -aG docker ubuntu
+   ```
+
+   Logout/login again.
+
+3. Clone envoy repo:
+
+   ```bash
+   mkdir -p $HOME/src/github.com/envoyproxy
+   git clone https://github.com/envoyproxy/envoy.git $HOME/src/github.com/envoyproxy/envoy
+   cd $HOME/src/github.com/envoyproxy/envoy
+   ```
+
+4. Build:
+
+   ```bash
+   ci/run_envoy_docker.sh 'ci/do_ci.sh bazel.release.server_only'
+   ```
+
+   This will take several hours to complete.
+
+5. Once done the binary is stored in /home/ubuntu/src/github.com/envoyproxy/envoy/build_release_stripped/envoy.
+
+- https://github.com/envoyproxy/envoy/issues/1861