Set correct Dockerfile for ARM builds

.github/workflows/docker-arm.yml

@@ -30,7 +30,7 @@ jobs:
         uses: docker/build-push-action@v2
         with:
           context: .
-          file: ./Dockerfile
+          file: ./Dockerfile.arm64
           platforms: linux/arm64
           push: true
           tags: spikecodes/libreddit:latest

Dockerfile.arm64

@@ -1,28 +1,37 @@
 ####################################################################################################
 ## Builder
 ####################################################################################################
-FROM rust:alpine AS builder
+FROM rust:latest AS builder
 
-RUN apk add --no-cache g++
+RUN rustup target add aarch64-unknown-linux-musl
+RUN apt update && apt install -y musl-tools musl-dev
+RUN update-ca-certificates
+
+RUN adduser --home /nonexistent --no-create-home --disabled-password libreddit
 
 WORKDIR /usr/src/libreddit
 
 COPY . .
 
-RUN cargo install --path .
+RUN cargo build --target aarch64-unknown-linux-musl --release
 
 ####################################################################################################
 ## Final image
 ####################################################################################################
-FROM alpine:latest
+FROM scratch
 
-RUN apk add --no-cache curl
+# Import user information from builder.
+COPY --from=builder /etc/passwd /etc/passwd
+COPY --from=builder /etc/group /etc/group
+
+# Import ca-certificates from builder
+COPY --from=builder /usr/share/ca-certificates /usr/share/ca-certificates
+COPY --from=builder /etc/ssl/certs /etc/ssl/certs
 
 # Copy our build
-COPY --from=builder /usr/local/cargo/bin/libreddit /usr/local/bin/libreddit
+COPY --from=builder /usr/src/libreddit/target/aarch64-unknown-linux-musl/release/libreddit /usr/local/bin/libreddit
 
 # Use an unprivileged user.
-RUN adduser --home /nonexistent --no-create-home --disabled-password libreddit
 USER libreddit
 
 # Tell Docker to expose port 8080