Add arm64 support to Docker images (#1541)

Closes: #XXX

## What is the purpose of the change

This PR extends the work done in #1535 to introduce support for `arm64` architecture making osmosis docker image multi-architecture (`amd64` and `arm64`).

I have also updated the CI to build and push the image for multiple architectures.

Please note that it takes ~20 minutes for the build complete but it would run only on every new tag so I think it's acceptable.

## Brief Changelog

- Modify Dockerfile to add `arm64` support
- Update docker CI to build and push for `arm64`

## Testing and Verifying

You can build for arm64 with:

```bash
docker buildx build --platform linux/arm64 --tag osmosis:arm64 .
```

I tested the CI in my fork: https://github.com/nikever/osmosis/runs/6505857265?check_suite_focus=true

## Documentation and Release Note

  - Does this pull request introduce a new feature or user-facing behavior changes? yes (`arm64` support!)
  - Is a relevant changelog entry added to the `Unreleased` section in `CHANGELOG.md`? yes
  - How is the feature or change documented? not applicable

.github/workflows/docker.yml

@@ -44,8 +44,9 @@ jobs:
           file: Dockerfile
           context: .
           push: true
-          platforms: linux/amd64
+          platforms: linux/amd64,linux/arm64
           tags: ${{ steps.meta.outputs.tags }}
+
       - 
         name: Image digest
         run: echo ${{ steps.docker_build.outputs.digest }}

CHANGELOG.md

@@ -48,6 +48,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 * [#1253] Add lockup duration edit method 
 * [#1312] Stableswap: Createpool logic 
 * [#1230] Stableswap CFMM equations
+* [#1541] Add arm64 support to Docker
 
 ## [v8.0.0 - Emergency proposals upgrade](https://github.com/osmosis-labs/osmosis/releases/tag/v8.0.0)
 

Dockerfile

@@ -1,28 +1,36 @@
 # syntax=docker/dockerfile:1
 
-ARG BASE_IMG_TAG=nonroot 
+ARG BASE_IMG_TAG=nonroot
+
+# --------------------------------------------------------
+# Build 
+# --------------------------------------------------------
 
-## Build Image
 FROM golang:1.18.2-alpine3.15 as build
 
 RUN set -eux; apk add --no-cache ca-certificates build-base;
-
 RUN apk add git
-
-# needed by github.com/zondax/hid
+# Needed by github.com/zondax/hid
 RUN apk add linux-headers
 
 WORKDIR /osmosis
 COPY . /osmosis
 
-# From https://github.com/CosmWasm/wasmd/blob/master/Dockerfile
-# For more details see https://github.com/CosmWasm/wasmvm#builds-of-libwasmvm 
-ADD https://github.com/CosmWasm/wasmvm/releases/download/v1.0.0/libwasmvm_muslc.x86_64.a /lib/libwasmvm_muslc.a
-RUN sha256sum /lib/libwasmvm_muslc.a | grep f6282df732a13dec836cda1f399dd874b1e3163504dbd9607c6af915b2740479
+# CosmWasm: see https://github.com/CosmWasm/wasmvm/releases
+ADD https://github.com/CosmWasm/wasmvm/releases/download/v1.0.0/libwasmvm_muslc.aarch64.a /lib/libwasmvm_muslc.aarch64.a
+ADD https://github.com/CosmWasm/wasmvm/releases/download/v1.0.0/libwasmvm_muslc.x86_64.a /lib/libwasmvm_muslc.x86_64.a
+RUN sha256sum /lib/libwasmvm_muslc.aarch64.a | grep 7d2239e9f25e96d0d4daba982ce92367aacf0cbd95d2facb8442268f2b1cc1fc
+RUN sha256sum /lib/libwasmvm_muslc.x86_64.a | grep f6282df732a13dec836cda1f399dd874b1e3163504dbd9607c6af915b2740479
+
+# CosmWasm: copy the right library according to architecture. The final location will be found by the linker flag `-lwasmvm_muslc`
+RUN cp /lib/libwasmvm_muslc.$(uname -m).a /lib/libwasmvm_muslc.a
 
 RUN BUILD_TAGS=muslc LINK_STATICALLY=true make build
 
-## Deploy image
+# --------------------------------------------------------
+# Runner
+# --------------------------------------------------------
+
 FROM gcr.io/distroless/base-debian11:${BASE_IMG_TAG}
 
 COPY --from=build /osmosis/build/osmosisd /bin/osmosisd
@@ -35,4 +43,3 @@ EXPOSE 26657
 EXPOSE 1317
 
 ENTRYPOINT ["osmosisd"]
-CMD [ "start" ]