MINIFICPP-2861 Add Conan support for docker and clang CI builds

[lordgamez]

https://issues.apache.org/jira/browse/MINIFICPP-2861

Depends on #2214

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[Copilot]

Pull request overview

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Adds Conan-based dependency handling for Docker builds and the Ubuntu clang CI job, including a custom Conan recipe for paho-mqtt-c and wiring credentials/flags through CMake → DockerBuild.sh → Dockerfiles.

Changes:

• Introduce a custom Conan recipe + metadata for paho-mqtt-c and switch MiNiFi’s Conan dependency to @minifi/develop
• Add Docker build support for running bootstrap/main.py --run-conan-install and using Conan toolchains
• Update CI to enable Conan for clang builds and upload Conan packages

Reviewed changes

Copilot reviewed 17 out of 18 changed files in this pull request and generated 5 comments.

Show a summary per file

File	Description
thirdparty/paho-mqtt/config.yml	Adds third-party Conan recipe version mapping for paho-mqtt
thirdparty/paho-mqtt/all/conanfile.py	Introduces custom Conan recipe for paho-mqtt-c
thirdparty/paho-mqtt/all/conandata.yml	Adds source + patch metadata for the recipe
docker/settings_user.yml	Adds Conan settings_user.yml override for Linux libc (musl)
docker/rockylinux/Dockerfile	Adds Conan bootstrap/install path and optional upload in Rocky build
docker/Dockerfile	Adds Conan bootstrap/install path and optional upload in Alpine build
docker/DockerBuild.sh	Adds build args/secrets for Conan and wires them into docker buildx
conanfile.py	Switches paho-mqtt-c ref to custom remote and tweaks toolchain blocks
cmake/PahoMqttC.cmake	Adjusts patch path for paho-mqtt-c build
cmake/MiNiFiOptions.cmake	Adds docker Conan options and filters them from MINIFI_OPTIONS passed into images
cmake/DockerConfig.cmake	Passes Docker Conan options into DockerBuild.sh invocation
bootstrap/package_manager.py	Adds APK package manager support for Alpine
bootstrap/minifi_option.py	Adds DOCKER_USE_CONAN to bootstrap option handling
bootstrap/main.py	Adds --run-conan-install entrypoint
bootstrap/cli.py	Improves Conan settings detection (libc++) and forces m4 build on Linux
.github/workflows/ci.yml	Enables Conan in CI (Docker + clang job) and uploads Conan packages
.dockerignore	Ensures docker/settings_user.yml is included in Docker build context

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