Adding otel tracing support and github action to push docker images on ghcr.io

[zwindler]

This pull request introduces a lot of changes, mainly adding otel tracing support (1.1 on my fork) and github action to push docker images on ghcr.io (1.2 on my fork)

Features:

• OpenTelemetry tracing support (with otlp HTTP authentication if required)
• migrated from Docker images to GitHub Container Registry with github action automation. Now deezer staff only have to git tag without the need to configure a docker token (for the docker push) && github token (for the release) on their local machine.

Chores:

• updated dependencies (golang 1.25, all deps)
• improved the documentation
• removed arm64 support for now (not really working and adds a lot of complexity to build phase)
• updated outdated goreleaser configuration parameters

Fixes:

• some queries used string concatenation instead of prepared statements. The risk was minimal since variables were wrapped in itoa conversions but this is obviously very bad practice nevertheless
• fixed double http server initialization which prevented proper software shutdown (CTRL-C was stuck in most cases))
• goreleaser was not testing the whole code
• fixed some static analysis errors in logging

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OpenTelemetry Tracing Support:

• Added OpenTelemetry tracing integration, including configuration options for enabling tracing, OTLP endpoint, and HTTP basic authentication via both environment variables and the new config.toml.default file. (internal/config/config.go, internal/config/loader.go, internal/middlewares/middlewareChain.go, internal/middlewares/tracing.go, config.toml.default, README.md) [1] [2] [3] [4] [5] [6] [7] [8]

Build and Release Workflow Modernization:

• Added a GitHub Actions workflow (.github/workflows/release.yml) for automated releases, including building, testing, and publishing binaries and Docker images to GitHub Container Registry. (.github/workflows/release.yml, .goreleaser.yaml, README.md) [1] [2] [3] [4] [5]
• Updated Go version requirements and dependency versions to Go 1.25 and latest libraries. (go.mod, Makefile, README.md) [1] [2] [3]

Docker and Configuration Improvements:

• Switched Docker image publishing from Docker Hub to GitHub Container Registry, updated image references, and improved Docker build configuration. (.goreleaser.yaml, Dockerfile, README.md) [1] [2] [3]
• Replaced config.toml with config.toml.default as the default config file, and improved documentation for configuration and prerequisites. (config.toml.default, README.md, Dockerfile) [1] [2] [3]

Documentation and Developer Experience:

• Expanded README with detailed configuration options, build instructions, cross-compilation notes, and clarified licensing for bundled fonts. (README.md) [1] [2] [3] [4]
• Added .gitkeep to datadir/ and improved comments for developer clarity. (datadir/.gitkeep)

Minor Code Quality Improvements:

• Improved SQL query safety and error logging in GetROTI by using parameterized queries and structured logging. (internal/model/roti.go) [1] [2]