Add cross-platform binary builds to PR and push workflows

[Copilot]

Enables building and downloading test binaries for all supported platforms on every PR and push to master, without waiting for release creation.

Changes

• .github/workflows/pull_request.yml: Added build job that produces binaries for 6 platform combinations (Linux/Darwin/FreeBSD × amd64/386/arm64)
• .github/workflows/push.yml: Added build-binaries job with identical configuration

Implementation

Reused the matrix strategy from release.yml with key differences:

• Dynamic versioning via git describe --tags --always --dirty instead of release tag
• Artifacts uploaded as workflow artifacts instead of release assets
• Full git history fetch (fetch-depth: 0) enables tag-based version strings

env:
  GOOS: ${{ matrix.goos }}
  GOARCH: ${{ matrix.goarch }}
  CGO_ENABLED: 0
run: |
  VERSION=$(git describe --tags --always --dirty 2>/dev/null || echo "dev-$(git rev-parse --short HEAD)")
  go build -ldflags "-X main.version=$VERSION" -o rss2email-${{ matrix.suffix }}

Existing lint/test jobs and release.yml unchanged.

Original prompt

Objective

Build cross-platform binaries for all supported platforms on every pull request and push to master, making them available as downloadable artifacts for testing before creating official releases.

Current State

• pull_request.yml only runs linting and tests
• push.yml only runs build and tests
• release.yml builds cross-platform binaries but only when a release is created

Required Changes

1. Update .github/workflows/pull_request.yml

Add a new job that builds binaries for all platforms using the same matrix strategy as release.yml:

• Linux (amd64, 386)
• Darwin/macOS (amd64, arm64)
• FreeBSD (amd64, 386)

The binaries should:

• Be built with CGO_ENABLED=0
• Use version string from git describe --tags (or similar)
• Be uploaded as workflow artifacts with appropriate names (e.g., rss2email-linux-amd64, rss2email-darwin-arm64, etc.)

This job should run in addition to the existing lint and test jobs.

2. Update .github/workflows/push.yml

Add the same binary building job as in pull_request.yml so that pushes to master also produce downloadable test binaries.

Implementation Notes

• Reuse the matrix strategy from release.yml (lines 11-31)
• Build step should be similar to release.yml line 45, but use a dynamic version (e.g., from git describe)
• Use actions/upload-artifact@v4 to make binaries downloadable
• Keep all existing jobs (lint, test) - just add the build job
• No need to upload to releases - artifacts are for testing only

Success Criteria

• Every PR run produces downloadable binaries for all 6 platform combinations
• Every push to master produces downloadable binaries for all 6 platform combinations
• Existing lint and test jobs continue to work
• release.yml remains unchanged and continues to work for actual releases

This pull request was created as a result of the following prompt from Copilot chat.

Objective

Build cross-platform binaries for all supported platforms on every pull request and push to master, making them available as downloadable artifacts for testing before creating official releases.

Current State

• pull_request.yml only runs linting and tests
• push.yml only runs build and tests
• release.yml builds cross-platform binaries but only when a release is created

Required Changes

1. Update .github/workflows/pull_request.yml

Add a new job that builds binaries for all platforms using the same matrix strategy as release.yml:

• Linux (amd64, 386)
• Darwin/macOS (amd64, arm64)
• FreeBSD (amd64, 386)

The binaries should:

• Be built with CGO_ENABLED=0
• Use version string from git describe --tags (or similar)
• Be uploaded as workflow artifacts with appropriate names (e.g., rss2email-linux-amd64, rss2email-darwin-arm64, etc.)

This job should run in addition to the existing lint and test jobs.

2. Update .github/workflows/push.yml

Add the same binary building job as in pull_request.yml so that pushes to master also produce downloadable test binaries.

Implementation Notes

• Reuse the matrix strategy from release.yml (lines 11-31)
• Build step should be similar to release.yml line 45, but use a dynamic version (e.g., from git describe)
• Use actions/upload-artifact@v4 to make binaries downloadable
• Keep all existing jobs (lint, test) - just add the build job
• No need to upload to releases - artifacts are for testing only

Success Criteria

• Every PR run produces downloadable binaries for all 6 platform combinations
• Every push to master produces downloadable binaries for all 6 platform combinations
• Existing lint and test jobs continue to work
• release.yml remains unchanged and continues to work for actual releases

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