ci(arm): Adds support for cross compilation and publishes Relay ARM d…

…ocker images (#3272)

Updates the build/ci to support building multi arch docker images.

- Removes the now-unused docker images and build scripts, they are no
longer used and we don't want to maintain them, they will eventually
break.
- Uses `regctl` to transfer multi arch images directly between
registries
- Fixes `relay-debug.zip` and `relay.src.zip` inconsistency


Future improvements:
- Add `aarch64-apple-darwin` to the matrix build
- Release aarch64 binaries on release builds
- Sign images (?)

.dockerignore

@@ -13,3 +13,6 @@
 
 !docker-entrypoint.sh
 !Makefile
+
+# CI files necessary for building the docker file
+!linux/

.github/workflows/build_binary.yml

@@ -18,25 +18,25 @@ jobs:
         with:
           submodules: recursive
 
-      - name: Build in Docker
+      - name: Install Rust Toolchain
+        run: rustup toolchain install stable --profile minimal --no-self-update
+
+      - name: Build binary
         run: |
-          # Get the latest stable rust toolchain version available
-          TOOLCHAIN=$(curl -s 'https://static.rust-lang.org/dist/channel-rust-stable.toml' | awk '/\[pkg.rust\]/ {getline;print;}' | sed -r 's/^version = "([0-9.]+) .*/\1/')
-          scripts/docker-build-linux.sh "$TOOLCHAIN"
+          make build-linux-release
         env:
-          BUILD_ARCH: x86_64
           RELAY_FEATURES:
 
       - name: Bundle Debug File
         run: |
-          cd target/x86_64-unknown-linux-gnu/release/
+          cd target/release/
           zip relay-Linux-x86_64-debug.zip relay.debug
           mv relay relay-Linux-x86_64
 
       - uses: actions/upload-artifact@v3
         with:
           name: ${{ github.sha }}
-          path: target/x86_64-unknown-linux-gnu/release/relay-Linux-x86_64*
+          path: target/release/relay-Linux-x86_64*
 
   macos:
     name: macOS