Add support for building Linux ARM64 binary in Makefile

[aaron-ang]

Summary by CodeRabbit

• Chores
  • Enhanced Linux build process to produce binaries for both AMD64 and ARM64 architectures.

[coderabbitai]

Walkthrough

The Makefile's linux build target was updated to include an additional build command for the Linux ARM64 architecture, alongside the existing build for Linux AMD64. Both builds use the same linker flags to embed Git commit hash, version, and build date. No other targets or logic were modified.

Changes

Cohort / File(s)	Change Summary
Makefile Update Makefile	Modified the linux build target to build binaries for both Linux AMD64 and ARM64 architectures, using consistent linker flags.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

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[coderabbitai]

Actionable comments posted: 0

🔭 Outside diff range comments (1)

Makefile (1)

44-49: Add $(BUILD_DIR) as an explicit prerequisite to avoid “no such directory” failures

If a fresh clone runs make linux before any other target, the build directory may not exist, causing both
go build -o $(BUILD_DIR)/… commands to fail. You already have a rule that creates the directory (Lines 65-68);
just declare it as a dependency:

-linux: ui
+linux: ui $(BUILD_DIR)

That guarantees the directory exists regardless of build order.

🧹 Nitpick comments (2)

Makefile (2)

44-49: Consider de-duplicating linker flags to reduce maintenance overhead

The two go build invocations are identical except for GOARCH and the output path. Extract the common
-ldflags string (and maybe GOOS) into a variable or use a pattern rule, e.g.:

LDFLAGS := -ldflags="-X main.commit=$(GIT_HASH) -X main.version=local_$(GIT_HASH) -X main.date=$(BUILD_DATE)"

linux: ui $(BUILD_DIR)
	@echo "Building Linux binaries..."
	$(foreach arch,amd64 arm64,\
		GOOS=linux GOARCH=$(arch) go build $(LDFLAGS) -o $(BUILD_DIR)/$(APP_NAME)-linux-$(arch);)

That keeps the flags in one place and makes adding new architectures trivial.

---

55-60: Optional: produce simple-responder for Linux ARM 64 to stay feature-par with main binary

Since the primary binary now supports arm64, you may want the helper simple-responder (Lines 55-60) to do the same:

 GOOS=linux GOARCH=amd64 go build -o $(BUILD_DIR)/simple-responder_linux_amd64 misc/simple-responder/simple-responder.go
+GOOS=linux GOARCH=arm64 go build -o $(BUILD_DIR)/simple-responder_linux_arm64 misc/simple-responder/simple-responder.go

This keeps tooling consistent across architectures.

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📥 Commits

Reviewing files that changed from the base of the PR and between 558a72d and 73b6d16.

📒 Files selected for processing (1)

• Makefile (1 hunks)

⏰ Context from checks skipped due to timeout of 90000ms. You can increase the timeout in your CodeRabbit configuration to a maximum of 15 minutes (900000ms). (1)

• GitHub Check: run-tests

🔇 Additional comments (1)

Makefile (1)

48-48: ARM 64 build step added — looks good

The additional GOOS=linux GOARCH=arm64 invocation correctly mirrors the existing amd64 step and produces
$(APP_NAME)-linux-arm64. Nice, this closes the gap for Apple/Graviton servers and similar platforms.

[mostlygeek]

thanks