Add nightly build workflow and update documentation

- Add GitHub Actions workflow for automated nightly builds
  - Builds for multiple platforms: Linux (amd64, arm64, arm), macOS (amd64, arm64), Windows (amd64, arm64)
  - Creates release artifacts with SHA256 checksums
  - Publishes to GitHub Releases with 'nightly' tag
  - Scheduled to run daily at 2:00 AM UTC with manual trigger option

- Update documentation to use --curl flag consistently
  - Replace all --curl-compat references with --curl in README.md
  - Fix typo: 'gurl is essentially gurl' -> 'gurl is essentially grpcurl'
  - Update cURL-compatible mode examples

- Add comprehensive curl compatibility documentation
  - Create CURL_COMPATIBILITY.md listing all supported/unsupported curl options
  - Document 45 supported options covering HTTP essentials
  - List ~185 unsupported options with reasoning

- Update .gitignore for build artifacts
  - Ignore gurl and grpcurl binaries
  - Ignore curl-help.txt reference file

This completes the dual-mode (gRPC + HTTP) implementation with proper
build automation and documentation.

Signed-off-by: AI Assistant <[email protected]>
Signed-off-by: Cloorc <[email protected]>

avoid overflow in various timeouts (fullstorydev#505)

update core Go version in go.mod to 1.21 (fullstorydev#495)

Update Dockerfile to use Go v1.21 (fullstorydev#455)

Use latest protoreflect to fix some bugs (fullstorydev#453)

* update to latest jhump/protoreflect

* be lenient when possible if server cannot furnish all dependencies

* move linting back to go 1.21 instead of latest go 1.22

* make staticcheck happy

Disable CGO for improved compatibility across distros (fullstorydev#420)

* Disable CGO for improved compatibility across distros

* Enabled CGO in tests for the race detector

Update go.mod, goreleaser for v1.8.8 (fullstorydev#413)

* Update go.mod, goreleaser for v1.8.8

* move ci check to go 1.20

* debug

* ci diff

Bump google.golang.org/protobuf from 1.28.0 to 1.28.1 (fullstorydev#327)

Bumps [google.golang.org/protobuf](https://github.com/protocolbuffers/protobuf-go) from 1.28.0 to 1.28.1.
- [Release notes](https://github.com/protocolbuffers/protobuf-go/releases)
- [Changelog](https://github.com/protocolbuffers/protobuf-go/blob/master/release.bash)
- [Commits](protocolbuffers/protobuf-go@v1.28.0...v1.28.1)

---
updated-dependencies:
- dependency-name: google.golang.org/protobuf
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

bump protoreflect again, to 1.10.3 (fullstorydev#290)

can't build s390x docker images; skip for now (fullstorydev#265)