feat: add linux/arm64 build and release support

[nahaktarun]

Issue: #71

Feature change:

• Added linux/arm64 to the Makefile’s PLATFORMS so make release now builds an ARM64 binary.
• Updated the release workflow to upload the ARM64 binary and its checksum to GitHub Releases.
• ARM64 binary can be tested using Docker.

How to test:

• Run make release locally (requires Docker) — check that releases/leafwiki--linux-arm64 and its checksum are produced.
• (optional) enable the buildx docker buildx create --use --name multiarch.
• Verify with the target build
  docker run --rm -it --platform linux/arm64 \ -v "$(pwd)":/app \ ubuntu:22.04 \ /app/releases/leafwiki-v0.1.0-linux-arm64 --help

Feel free to review and test .

[Copilot]

Pull Request Overview

This PR adds support for building and releasing a linux/arm64 binary alongside existing platforms.

• Updated Makefile to include linux/arm64 in the build targets
• Enhanced the GitHub release workflow to upload the ARM64 binary and checksum

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
Makefile	Added linux/arm64 to PLATFORMS for ARM builds
.github/workflows/release.yml	Included ARM64 artifacts in the release upload

Comments suppressed due to low confidence (1)

Makefile:7

• Update this comment to reflect the addition of linux/arm64, e.g., # At the moment we can test on linux/amd64, linux/arm64, and windows/amd64.

# At the moment we only can test it on linux/amd64 and windows/amd64

[perber]

@nahaktarun Thanks! Your change is looking good. I will test it the upcoming days and leave it open until I tried it on my raspi.

[perber]

I tested it via the Docker:

FROM --platform=linux/arm64 debian:bullseye-slim

WORKDIR /app
COPY releases/leafwiki-v0.1.0-linux-arm64 /app/leafwiki

EXPOSE 9595

CMD ["/app/leafwiki", "--jwt-secret", "test1234567", "--port", "9595"]

docker buildx build \
  --platform linux/arm64 \
  -f Dockerfile.arm64 \
  -t leafwiki-arm64-runtime \
  --load .

file releases/leafwiki-v0.1.0-linux-arm64
releases/leafwiki-v0.1.0-linux-arm64: ELF 64-bit LSB executable, ARM aarch64, version 1 (SYSV), statically linked, Go BuildID=U6HcXS1ZycQ2qplkNCvD/I8swxEoJUmKqtdLTZ1PG/o4-EuinovSZNHqhEYy54/JxVwTBzfWMIaYV7N4BQt, stripped