chore: build for multiple architectures on release

Fixes #52.

.github/workflows/release.yaml

@@ -38,7 +38,7 @@ jobs:
           go-version: "~1.20"
 
       - name: Build
-        run: ./scripts/build.sh
+        run: ./scripts/build.sh --arch=amd64 --arch=arm64 --arch=arm
 
       - name: Docker Login
         uses: docker/login-action@v2
@@ -52,8 +52,8 @@ jobs:
           VERSION=$(./scripts/version.sh)
           BASE=ghcr.io/coder/envbuilder
           IMAGE=$BASE:$VERSION
-          docker tag envbuilder:latest $IMAGE
-          docker tag envbuilder:latest $BASE:latest
-          docker push $IMAGE
+          for arch in ( amd64 arm64 arm ); do
+            docker tag envbuilder:$arch $IMAGE-$arch
+            docker push $IMAGE-$arch
+          done
           docker push $BASE:latest
-

.gitignore

@@ -1 +1 @@
-scripts/envbuilder
+scripts/envbuilder-*

scripts/Dockerfile

@@ -1,6 +1,7 @@
 FROM scratch
+ARG PLATFORM
 
-COPY envbuilder /.envbuilder/bin/envbuilder
+COPY envbuilder-${PLATFORM} /.envbuilder/bin/envbuilder
 
 ENV KANIKO_DIR /.envbuilder
 # Kaniko looks for the Docker config at $DOCKER_CONFIG/config.json

scripts/build.sh

@@ -1,7 +1,33 @@
 #!/usr/bin/env bash
 
 cd $(dirname "${BASH_SOURCE[0]}")
-set -euxo pipefail
+set -euo pipefail
 
-CGO_ENABLED=0 go build -o ./envbuilder ../cmd/envbuilder
-docker build -t envbuilder:latest .
+archs=()
+for arg in "$@"; do
+  if [[ $arg == --arch=* ]]; then
+    arch="${arg#*=}"
+    archs+=( "$arch" )
+  else
+    echo "Unknown argument: $arg"
+    exit 1
+  fi
+done
+
+current=$(go env GOARCH)
+if [ ${#archs[@]} -eq 0 ]; then
+  echo "No architectures specified. Defaulting to $current..."
+  archs=( "$current" ) 
+fi
+
+for arch in "${archs[@]}"; do
+  GOARCH=$arch CGO_ENABLED=0 go build -o ./envbuilder-$arch ../cmd/envbuilder && \
+    docker build --build-arg PLATFORM=$arch -t envbuilder:${arch} -f Dockerfile . &
+done
+wait
+
+# Check if archs contains the current. If so, then output a message!
+if [[ " ${archs[@]} " =~ " ${current} " ]]; then
+  docker tag envbuilder:${arch} envbuilder:latest
+  echo "Tagged $current as envbuilder:latest!"
+fi