chore: parallel builds with Makefile (#3854)

* Revert "revert: Makefile buff-ification (#3700) (#3848)"

This reverts commit e490bdd531.

* fix: fix slim targets in makefile

* fix: don't clobber slim binaries, make sure they're in the correct location

scripts/build_go.sh

@@ -12,7 +12,7 @@
 # with "vX" (e.g. "v7", "v8").
 #
 # Unless overridden via --output, the built binary will be dropped in
-# "$repo_root/dist/coder_$version_$os_$arch" (with a ".exe" suffix for windows
+# "$repo_root/build/coder_$version_$os_$arch" (with a ".exe" suffix for windows
 # builds) and the absolute path to the binary will be printed to stdout on
 # completion.
 #
@@ -26,13 +26,12 @@
 set -euo pipefail
 # shellcheck source=scripts/lib.sh
 source "$(dirname "${BASH_SOURCE[0]}")/lib.sh"
-cdroot
 
 version=""
 os="${GOOS:-linux}"
 arch="${GOARCH:-amd64}"
 slim="${CODER_SLIM_BUILD:-0}"
-sign_darwin=0
+sign_darwin="${CODER_SIGN_DARWIN:-0}"
 output_path=""
 agpl="${CODER_BUILD_AGPL:-0}"
 
@@ -53,6 +52,7 @@ while true; do
 		shift 2
 		;;
 	--output)
+		mkdir -p "$(dirname "$2")"
 		output_path="$(realpath "$2")"
 		shift 2
 		;;
@@ -81,6 +81,8 @@ while true; do
 	esac
 done
 
+cdroot
+
 # Remove the "v" prefix.
 version="${version#v}"
 if [[ "$version" == "" ]]; then
@@ -102,9 +104,8 @@ fi
 
 # Compute default output path.
 if [[ "$output_path" == "" ]]; then
-	dist_dir="dist"
-	mkdir -p "$dist_dir"
-	output_path="${dist_dir}/coder_${version}_${os}_${arch}"
+	mkdir -p "build"
+	output_path="build/coder_${version}_${os}_${arch}"
 	if [[ "$os" == "windows" ]]; then
 		output_path+=".exe"
 	fi
@@ -132,7 +133,13 @@ CGO_ENABLED=0 GOOS="$os" GOARCH="$arch" GOARM="$arm_version" go build \
 	"$cmd_path" 1>&2
 
 if [[ "$sign_darwin" == 1 ]] && [[ "$os" == "darwin" ]]; then
-	codesign -s "$AC_APPLICATION_IDENTITY" -f -v --timestamp --options runtime "$output_path"
+	codesign \
+		-f -v \
+		-s "$AC_APPLICATION_IDENTITY" \
+		--timestamp \
+		--options runtime \
+		"$output_path" \
+		1>&2
 fi
 
 echo "$output_path"