Add ubuntu/resolute dockerfile for 10.2.0 builds

[cmcfarlen]

Updated the Dockerfile to use ubuntu/resolute, clang22 and openssl instead of boring.

% podman run -it --rm  docker.io/trafficserver/trafficserver:latest /opt/bin/traffic_layout info --features
Trying to pull docker.io/trafficserver/trafficserver:latest...
Getting image source signatures
Copying blob 795448248960 done   |
Copying blob 06e9d71331fb done   |
Copying blob 46516aa72f5c done   |
Copying blob 9c46ef0398a7 done   |
Copying blob f3db1cd94078 done   |
Copying config 0a8e912545 done   |
Writing manifest to image destination
#define BUILD_MACHINE "buildkitsandbox"
#define BUILD_PERSON "root"
#define BUILD_GROUP "root"
#define BUILD_NUMBER "0"
#define TS_HAS_LZMA 1
#define TS_HAS_BROTLI 1
#define TS_HAS_ZSTD 1
#define TS_HAS_CERT_COMPRESSION 1
#define TS_HAS_CERT_COMPRESSION_CALLBACKS 0
#define TS_HAS_CERT_COMPRESSION_ZLIB 1
#define TS_HAS_CERT_COMPRESSION_BROTLI 0
#define TS_HAS_CERT_COMPRESSION_ZSTD 1
#define TS_HAS_CRIPTS 1
#define TS_HAS_PIPE_BUFFER_SIZE_CONFIG 1
#define TS_HAS_JEMALLOC 1
#define TS_HAS_IN6_IS_ADDR_UNSPECIFIED 1
#define TS_HAS_BACKTRACE 1
#define TS_HAS_PROFILER 0
#define TS_USE_FAST_SDK 0
#define TS_USE_DIAGS 1
#define TS_USE_CACHE_SHM 1
#define TS_USE_EPOLL 1
#define TS_USE_KQUEUE 0
#define TS_USE_POSIX_CAP 1
#define TS_USE_TPROXY 1
#define TS_HAS_SO_MARK 1
#define TS_HAS_IP_TOS 1
#define TS_USE_HWLOC 1
#define TS_USE_TLS13 1
#define TS_USE_QUIC 1
#define TS_USE_QMUX 0
#define TS_HAS_OPENSSL_QUIC 1
#define TS_HAS_QUICHE 0
#define TS_HAS_SO_PEERCRED 1
#define TS_USE_REMOTE_UNWINDING 0
#define SIZEOF_VOIDP 8
#define TS_IP_TRANSPARENT 19
#define TS_HAS_128BIT_CAS 1
#define TS_HAS_TESTS 0
#define TS_MAX_THREADS_IN_EACH_THREAD_TYPE 3072
#define TS_MAX_NUMBER_EVENT_THREADS 4096
#define TS_MAX_HOST_NAME_LEN 256
#define TS_PKGSYSUSER "nobody"
#define TS_PKGSYSGROUP "nogroup"

% podman run -it --rm  docker.io/trafficserver/trafficserver:latest /opt/bin/traffic_layout --version
Apache Traffic Server - traffic_layout - 10.2.0 - (build # 0 on Aug 19 2026 at 20:06:38)

[Copilot]

Pull request overview

Adds a new container build recipe under contrib/docker/ubuntu/ to produce an Apache Traffic Server 10.2.0 image based on Ubuntu resolute, using LLVM/Clang 22 and system OpenSSL (rather than the existing noble image’s BoringSSL-based build).

Changes:

• Introduces a new multi-stage Dockerfile that builds ATS 10.2.0 from source on ubuntu:resolute.
• Switches the toolchain to LLVM/Clang 22 (with LLD) and links against distro-provided OpenSSL.
• Defines a runtime image with the required shared-library dependencies and installs ATS into /opt.

Suppressed comments (1)

contrib/docker/ubuntu/resolute/Dockerfile:80

• The build is hard-coded to clang-22/clang++-22 even though LLVM_VERSION is an ARG. This makes LLVM_VERSION misleading and will break if it’s overridden at build time. Use clang-${LLVM_VERSION} consistently (or rely on cc/c++ after update-alternatives).

     -DBUILD_SHARED_LIBS=ON \
     -DCMAKE_C_COMPILER=clang-22 \
     -DCMAKE_CXX_COMPILER=clang++-22 \
     -DCMAKE_LINKER_TYPE=LLD \

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