compile for arm/v6 too

.github/workflows/main.yml

@@ -4,6 +4,9 @@ on:
   push:
     branches:
       - main
+  pull_request:
+    branches:
+      - main
 
 jobs:
   docker:
@@ -32,8 +35,8 @@ jobs:
         uses: docker/build-push-action@v2
         with:
           context: .
-          platforms: linux/amd64,linux/arm64,linux/arm
-          push: true
+          platforms: linux/arm64,linux/arm/v6
+          push: ${{ github.ref == 'refs/heads/master' }}
           tags: texthtml/midi-synthesizer-autoconnect:latest
           cache-from: type=gha
           cache-to: type=gha,mode=max

Dockerfile

@@ -1,8 +1,10 @@
-FROM rust:1.54-bullseye AS builder
+FROM alpine AS builder
 
-WORKDIR /app
+RUN apk add cargo --repository=http://dl-cdn.alpinelinux.org/alpine/edge/testing/
+
+RUN apk add alsa-lib-dev
 
-RUN apt-get update && apt-get install -y libasound2-dev
+WORKDIR /app
 
 ADD .cargo /app/.cargo/
 ADD Cargo.toml Cargo.lock .cargo /app/
@@ -16,11 +18,9 @@ ADD src /app/src/
 RUN touch src/main.rs && \
     cargo build --release --offline
 
-FROM debian:bullseye
+FROM alpine
 
-RUN apt-get update && \
-    apt-get install -y libasound2 && \
-    rm -rf /var/lib/apt/lists/*
+RUN apk add --no-cache libgcc alsa-lib
 
 COPY --from=builder /app/target/release/midi-synthesizer-autoconnect /usr/bin/