feat(ci): move rust docker target bash to shell script

.github/workflows/rust.yml

@@ -12,8 +12,8 @@ on:
     - 'services/gateway/**'
     - 'services/avatars/**'
     - '.github/workflows/rust.yml'
-    - 'Dockerfile.rust'
-    - 'Dockerfile.bin'
+    - 'ci/Dockerfile.rust'
+    - 'ci/rust-docker-target.sh'
     - 'Cargo.toml'
     - 'Cargo.lock'
 
@@ -40,7 +40,7 @@ jobs:
         with:
           # https://github.com/docker/build-push-action/issues/378
           context: .
-          file: Dockerfile.rust
+          file: ci/Dockerfile.rust
           push: false 
           cache-from: type=registry,ref=ghcr.io/pluralkit/docker-cache:rust
           cache-to: type=registry,ref=ghcr.io/pluralkit/docker-cache:rust,mode=max
@@ -48,13 +48,7 @@ jobs:
 
       # add more binaries here
       - run: |
-          for binary in "api" "gateway" "avatars"; do
-            for tag in latest ${{ env.BRANCH_NAME }} ${{ github.sha }}; do
-              cat Dockerfile.bin | sed "s/__BINARY__/$binary/g" | docker build -t ghcr.io/pluralkit/$binary:$tag -f - .
-            done
-            if [ "${{ github.repository }}" == "PluralKit/PluralKit" ]; then
-              docker push ghcr.io/pluralkit/$binary:${{ env.BRANCH_NAME }}
-              docker push ghcr.io/pluralkit/$binary:${{ github.sha }}
-              [ "${{ env.BRANCH_NAME }}" == "main" ] && docker push ghcr.io/pluralkit/$binary:latest
-            fi
-          done
+          tag=${{ github.sha }} \
+          branch=${{ env.BRANCH_NAME }} \
+          push=$([ "${{ github.repository }}" == "PluralKit/PluralKit" ] && echo true || echo false) \
+          ci/rust-docker-target.sh

Dockerfile.bin

@@ -1,5 +0,0 @@
-FROM alpine:latest
-
-COPY /.docker-bin/__BINARY__ /bin/__BINARY__
-
-CMD ["/bin/__BINARY__"]

ci/Dockerfile.rust

@@ -39,3 +39,4 @@ FROM scratch
 COPY --from=binary-builder /build/target/x86_64-unknown-linux-musl/release/api /api
 COPY --from=binary-builder /build/target/x86_64-unknown-linux-musl/release/gateway /gateway
 COPY --from=binary-builder /build/target/x86_64-unknown-linux-musl/release/avatars /avatars
+COPY --from=binary-builder /build/target/x86_64-unknown-linux-musl/release/avatars /avatars

ci/rust-docker-target.sh

@@ -0,0 +1,42 @@
+#!/bin/bash
+
+set -e
+
+#tag=
+#branch=
+#push=
+
+build() {
+    bin=$1
+    extra=$2
+
+    f=$(mktemp)
+
+    cat > $f << EOF
+FROM alpine:latest
+COPY .docker-bin/$bin /bin/$bin
+$extra
+CMD ["/bin/$bin"]
+EOF
+
+    echo "building $dockerfile"
+
+    $dockerfile | docker build -t ghcr.io/pluralkit/$bin:$tag -f $f .
+
+    rm $f
+
+    if [ "$push" == "true" ]; then
+      docker push ghcr.io/pluralkit/$bin:$tag
+      docker image tag ghcr.io/pluralkit/$bin:$tag ghcr.io/pluralkit/$bin:$branch
+      docker push ghcr.io/pluralkit/$bin:$branch
+      if [ "$branch" == "main" ]; then
+        docker image tag ghcr.io/pluralkit/$bin:$tag ghcr.io/pluralkit/$bin:latest
+        docker push ghcr.io/pluralkit/$bin:latest
+      fi
+    fi
+}
+
+# add rust binaries here to build
+build api
+build gateway
+build avatars

services/avatars/Dockerfile

@@ -0,0 +1,88 @@
+# syntax=docker/dockerfile:1
+
+# Comments are provided throughout this file to help you get started.
+# If you need more help, visit the Dockerfile reference guide at
+# https://docs.docker.com/go/dockerfile-reference/
+
+ARG RUST_VERSION=1.75.0
+ARG APP_NAME=pluralkit-avatars
+
+################################################################################
+# xx is a helper for cross-compilation.
+# See https://github.com/tonistiigi/xx/ for more information.
+FROM --platform=$BUILDPLATFORM tonistiigi/xx:1.3.0 AS xx
+
+################################################################################
+# Create a stage for building the application.
+FROM --platform=$BUILDPLATFORM rust:${RUST_VERSION}-alpine AS build
+ARG APP_NAME
+WORKDIR /app
+
+# Copy cross compilation utilities from the xx stage.
+COPY --from=xx / /
+
+# Install host build dependencies.
+RUN apk add --no-cache clang lld musl-dev git file
+
+# This is the architecture you’re building for, which is passed in by the builder.
+# Placing it here allows the previous steps to be cached across architectures.
+ARG TARGETPLATFORM
+
+# Install cross compilation build dependencies.
+RUN xx-apk add --no-cache musl-dev gcc
+
+# Build the application.
+# Leverage a cache mount to /usr/local/cargo/registry/
+# for downloaded dependencies, a cache mount to /usr/local/cargo/git/db
+# for git repository dependencies, and a cache mount to /app/target/ for 
+# compiled dependencies which will speed up subsequent builds.
+# Leverage a bind mount to the src directory to avoid having to copy the
+# source code into the container. Once built, copy the executable to an
+# output directory before the cache mounted /app/target is unmounted.
+# XXX: removed `id` from target mount, see: https://github.com/reproducible-containers/buildkit-cache-dance/issues/12
+RUN --mount=type=bind,source=src,target=src \
+    --mount=type=bind,source=Cargo.toml,target=Cargo.toml \
+    --mount=type=bind,source=Cargo.lock,target=Cargo.lock \
+    --mount=type=cache,target=/app/target/$TARGETPLATFORM/ \
+    --mount=type=cache,target=/usr/local/cargo/git/db \
+    --mount=type=cache,target=/usr/local/cargo/registry/ \
+    <<EOF
+set -e
+xx-cargo build --locked --release --target-dir ./target/$TARGETPLATFORM/
+cp ./target/$TARGETPLATFORM/$(xx-cargo --print-target-triple)/release/$APP_NAME /bin/server
+xx-verify /bin/server
+EOF
+
+################################################################################
+# Create a new stage for running the application that contains the minimal
+# runtime dependencies for the application. This often uses a different base
+# image from the build stage where the necessary files are copied from the build
+# stage.
+#
+# The example below uses the alpine image as the foundation for running the app.
+# By specifying the "3.18" tag, it will use version 3.18 of alpine. If
+# reproducability is important, consider using a digest
+# (e.g., alpine@sha256:664888ac9cfd28068e062c991ebcff4b4c7307dc8dd4df9e728bedde5c449d91).
+FROM alpine:3.18 AS final
+
+# Create a non-privileged user that the app will run under.
+# See https://docs.docker.com/go/dockerfile-user-best-practices/
+ARG UID=10001
+RUN adduser \
+    --disabled-password \
+    --gecos "" \
+    --home "/nonexistent" \
+    --shell "/sbin/nologin" \
+    --no-create-home \
+    --uid "${UID}" \
+    appuser
+USER appuser
+
+# Copy the executable from the "build" stage.
+COPY --from=build /bin/server /bin/
+
+# Expose the port that the application listens on.
+EXPOSE 3000
+
+# What the container should run when it is started.
+CMD ["/bin/server"]