Also build ARM64 images

.github/workflows/build.yml

@@ -38,6 +38,10 @@ jobs:
     steps:
       - uses: actions/checkout@v2
 
+      - uses: docker/setup-qemu-action@v1
+
+      - uses: docker/setup-buildx-action@v1
+
       - uses: docker/login-action@v1
         if: github.event_name != 'pull_request'
         with:
@@ -54,6 +58,7 @@ jobs:
       - uses: docker/build-push-action@v2
         with:
           context: ${{ matrix.context }}
+          platforms: linux/amd64,linux/arm64
           push: ${{ github.event_name != 'pull_request' }}
           tags: ${{ steps.meta.outputs.tags }}
           labels: ${{ steps.meta.outputs.labels }}

alpine3.12/Dockerfile

@@ -1,15 +1,22 @@
 FROM alpine:3.12
 
+RUN apk add --no-cache \
+        ca-certificates \
+        gcc
+
 ENV RUSTUP_HOME=/usr/local/rustup \
     CARGO_HOME=/usr/local/cargo \
     PATH=/usr/local/cargo/bin:$PATH
 
 RUN set -eux; \
-    apk add --no-cache \
-    ca-certificates \
-    gcc; \
+    apkArch="$(apk --print-arch)"; \
+    case "$apkArch" in \
+        x86_64) rustArch='x86_64-unknown-linux-musl' ;; \
+        aarch64) rustArch='aarch64-unknown-linux-musl' ;; \
+        *) echo >&2 "unsupported architecture: $apkArch"; exit 1 ;; \
+    esac; \
     \
-    url="https://static.rust-lang.org/rustup/dist/x86_64-unknown-linux-musl/rustup-init"; \
+    url="https://static.rust-lang.org/rustup/dist/${rustArch}/rustup-init"; \
     wget "$url"; \
     chmod +x rustup-init; \
     ./rustup-init -y --no-modify-path --default-toolchain nightly; \

bullseye/Dockerfile

@@ -5,8 +5,14 @@ ENV RUSTUP_HOME=/usr/local/rustup \
     PATH=/usr/local/cargo/bin:$PATH
 
 RUN set -eux; \
+    dpkgArch="$(dpkg --print-architecture)"; \
+    case "${dpkgArch##*-}" in \
+        amd64) rustArch='x86_64-unknown-linux-gnu' ;; \
+        arm64) rustArch='aarch64-unknown-linux-gnu' ;; \
+        *) echo >&2 "unsupported architecture: ${dpkgArch}"; exit 1 ;; \
+    esac; \
     \
-    url="https://static.rust-lang.org/rustup/dist/x86_64-unknown-linux-gnu/rustup-init"; \
+    url="https://static.rust-lang.org/rustup/dist/${rustArch}/rustup-init"; \
     wget "$url"; \
     chmod +x rustup-init; \
     ./rustup-init -y --no-modify-path --default-toolchain nightly; \

bullseye/slim/Dockerfile

@@ -12,8 +12,14 @@ RUN set -eux; \
         libc6-dev \
         wget \
         ; \
+    dpkgArch="$(dpkg --print-architecture)"; \
+    case "${dpkgArch##*-}" in \
+        amd64) rustArch='x86_64-unknown-linux-gnu' ;; \
+        arm64) rustArch='aarch64-unknown-linux-gnu' ;; \
+        *) echo >&2 "unsupported architecture: ${dpkgArch}"; exit 1 ;; \
+    esac; \
     \
-    url="https://static.rust-lang.org/rustup/dist/x86_64-unknown-linux-gnu/rustup-init"; \
+    url="https://static.rust-lang.org/rustup/dist/${rustArch}/rustup-init"; \
     wget "$url"; \
     chmod +x rustup-init; \
     ./rustup-init -y --no-modify-path --default-toolchain nightly; \

buster/Dockerfile

@@ -5,8 +5,14 @@ ENV RUSTUP_HOME=/usr/local/rustup \
     PATH=/usr/local/cargo/bin:$PATH
 
 RUN set -eux; \
+    dpkgArch="$(dpkg --print-architecture)"; \
+    case "${dpkgArch##*-}" in \
+        amd64) rustArch='x86_64-unknown-linux-gnu' ;; \
+        arm64) rustArch='aarch64-unknown-linux-gnu' ;; \
+        *) echo >&2 "unsupported architecture: ${dpkgArch}"; exit 1 ;; \
+    esac; \
     \
-    url="https://static.rust-lang.org/rustup/dist/x86_64-unknown-linux-gnu/rustup-init"; \
+    url="https://static.rust-lang.org/rustup/dist/${rustArch}/rustup-init"; \
     wget "$url"; \
     chmod +x rustup-init; \
     ./rustup-init -y --no-modify-path --default-toolchain nightly; \

buster/slim/Dockerfile

@@ -12,8 +12,14 @@ RUN set -eux; \
         libc6-dev \
         wget \
         ; \
+    dpkgArch="$(dpkg --print-architecture)"; \
+    case "${dpkgArch##*-}" in \
+        amd64) rustArch='x86_64-unknown-linux-gnu' ;; \
+        arm64) rustArch='aarch64-unknown-linux-gnu' ;; \
+        *) echo >&2 "unsupported architecture: ${dpkgArch}"; exit 1 ;; \
+    esac; \
     \
-    url="https://static.rust-lang.org/rustup/dist/x86_64-unknown-linux-gnu/rustup-init"; \
+    url="https://static.rust-lang.org/rustup/dist/${rustArch}/rustup-init"; \
     wget "$url"; \
     chmod +x rustup-init; \
     ./rustup-init -y --no-modify-path --default-toolchain nightly; \