* #1009 macOS: add native Intel (x86_64) build alongside arm64
The macOS workflow only built on the arm64 runner (macos-15), producing
an Apple Silicon-only artifact that could not launch on Intel Macs.
Turn the single build job into a matrix that also builds natively on
GitHub's Intel runner (macos-15-intel), uploading a separate
ResInsight-macOS-x64 artifact next to ResInsight-macOS-arm64. All cache
keys (buildcache tool, buildcache contents, vcpkg) are qualified by
architecture so the two legs cache independently, and fail-fast is
disabled so a broken Intel leg never withholds the arm64 artifact.
The Intel leg uses a 13.3 deployment target: Apple's libc++ only ships
the <format> / std::to_chars(float) runtime symbols from macOS 13.3, and
the code (e.g. custom-surfio) uses std::format on floating-point values,
so a lower target fails to compile. 13.3 stays well below the runner's
macOS 15 SDK, keeping older Intel Macs supported.
release-draft.yml now downloads both macOS artifacts via a glob so each
architecture is attached to the draft release as its own zip.
Add rhel8-package.yml that builds a RHEL8 install package from a tag
using the prebuilt RHEL8 CI container. It configures with an install
prefix, builds the install target, runs the CPack package target, and
uploads the resulting *.tar.gz as the ResInsight-RHEL8 artifact.
Wire the new workflow into release-draft.yml so the draft release waits
for the RHEL8 package run and attaches the *.tar.gz directly, alongside
the existing zipped platform artifacts.
On a tag push, wait for the Windows/Linux build (ResInsightWithCache.yml)
and the macOS build (ResInsightMac.yml) to finish, download their
application artifacts, zip them per platform, and create a draft GitHub
Release with the archives attached for maintainer review.
Magne Sjaastad