Add support for ARM

Author: DRSchlaubi

.github/workflows/ci.yml

@@ -37,6 +37,7 @@ jobs:
       # Workaround: https://github.com/docker/build-push-action/issues/461
       - name: Setup Docker buildx
         uses: docker/[email protected]
+      - uses: docker/setup-qemu-action@v2
 
       # Login against a Docker registry except on PR
       # https://github.com/docker/login-action
@@ -63,6 +64,7 @@ jobs:
         uses: docker/[email protected]
         with:
           context: .
+          platforms: linux/amd64,linux/arm64
           push: ${{ github.event_name != 'pull_request' }}
           tags: ${{ steps.meta.outputs.tags }}
           labels: ${{ steps.meta.outputs.labels }}

Dockerfile

@@ -1,4 +1,4 @@
-FROM alpine AS curl
+FROM --platform=$TARGETOS/$TARGETARCH alpine AS curl
 
 # Install build dependencies
 RUN apk add openssl-dev make g++ curl
@@ -15,7 +15,10 @@ RUN ./configure --with-openssl --enable-websockets
 # Compile
 RUN make && make install
 
-FROM alpine
+FROM --platform=$TARGETOS/$TARGETARCH alpine
+
+LABEL org.opencontainers.image.source="https://github.com/kordlib/docker"
+LABEL org.opencontainers.image.licenses=MIT
 
 # See https://youtrack.jetbrains.com/issue/KT-38876/#focus=Comments-27-4805258.0-0
 RUN apk add gcompat