Add julia-tests-ubuntu.yml as a CI job

This CI job installs Julia, compiles HiGHS using the Yggdrasil script,
and then runs all of the tests for HiGHS.jl.

This CI job should ensure that we do not break the build of HiGHS_jll,
and it also provides access to a much greater range of unit tests for
the HiGHS C API, by way of HiGHS.jl and MathOptInterface.jl

Author: odow

.github/julia/build_tarballs.jl

@@ -0,0 +1,77 @@
+# !!! note
+#     This file is a version of the file we use to package HiGHS for the Julia
+#     ecosystem. If you make changes to this file during the development of
+#     HiGHS, please tag `@odow` so we can make the correponding changes to:
+#     https://github.com/JuliaPackaging/Yggdrasil/blob/master/H/HiGHS
+
+using BinaryBuilder, Pkg
+
+name = "HiGHS"
+version = VersionNumber(ENV["HIGHS_RELEASE"])
+
+sources = [GitSource(ENV["HIGHS_URL"], ENV["HIGHS_COMMIT"])]
+
+script = raw"""
+export BUILD_SHARED="ON"
+export BUILD_STATIC="OFF"
+
+cd $WORKSPACE/srcdir/HiGHS
+
+# Remove system CMake to use the jll version
+apk del cmake
+
+mkdir -p build
+cd build
+
+# Do fully static build only on Windows
+if [[ "${BUILD_SHARED}" == "OFF" ]] && [[ "${target}" == *-mingw* ]]; then
+    export CXXFLAGS="-static"
+fi
+
+cmake -DCMAKE_INSTALL_PREFIX=${prefix} \
+    -DCMAKE_TOOLCHAIN_FILE=${CMAKE_TARGET_TOOLCHAIN} \
+    -DCMAKE_BUILD_TYPE=Release \
+    -DBUILD_SHARED_LIBS=${BUILD_SHARED} \
+    -DZLIB_USE_STATIC_LIBS=${BUILD_STATIC} \
+    -DFAST_BUILD=ON ..
+
+if [[ "${target}" == *-linux-* ]]; then
+        make -j ${nproc}
+else
+    if [[ "${target}" == *-mingw* ]]; then
+        cmake --build . --config Release
+    else
+        cmake --build . --config Release --parallel
+    fi
+fi
+make install
+
+install_license ../LICENSE.txt
+"""
+
+products = [
+    LibraryProduct("libhighs", :libhighs),
+    ExecutableProduct("highs", :highs),
+]
+
+platforms = supported_platforms()
+platforms = expand_cxxstring_abis(platforms)
+
+dependencies = [
+    Dependency("CompilerSupportLibraries_jll"),
+    Dependency("Zlib_jll"),
+    HostBuildDependency(PackageSpec(; name="CMake_jll")),
+]
+
+build_tarballs(
+    ARGS,
+    name,
+    version,
+    sources,
+    script,
+    platforms,
+    products,
+    dependencies;
+    preferred_gcc_version = v"6",
+    julia_compat = "1.6",
+)

.github/workflows/julia-tests-ubuntu.yml

@@ -0,0 +1,63 @@
+name: JuliaCompileAndTest
+on:
+  push:
+    branches: [master, latest]
+  pull_request:
+    types: [opened, synchronize, ready_for_review, reopened]
+# needed to allow julia-actions/cache to delete old caches that it has created
+permissions:
+  actions: write
+  contents: read
+jobs:
+  test:
+    name: Julia - ${{ github.event_name }}
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      # Install Julia 1.7 for BinaryBuilder. Note that this is an old version of
+      # Julia, but it is required for compatibility with BinaryBuilder.
+      - uses: julia-actions/setup-julia@v2
+        with:
+          version: "1.7"
+          arch: x64
+      - uses: julia-actions/cache@v2
+      # Set the environment variables required by BinaryBuilder.
+      - run: |
+          git fetch --tags
+          echo "HIGHS_RELEASE=$(git describe --tags $(git rev-list --tags --max-count=1) | sed 's/^v//')" >> $GITHUB_ENV
+          if [ "${{ github.event_name }}" = "pull_request" ]; then
+            echo "HIGHS_COMMIT=${{ github.event.pull_request.head.sha }}" >> $GITHUB_ENV
+            echo "HIGHS_URL=${{ github.event.pull_request.head.repo.clone_url }}" >> $GITHUB_ENV
+          else
+            echo "HIGHS_COMMIT=${{ github.sha }}" >> $GITHUB_ENV
+            echo "HIGHS_URL=https://github.com/${{ github.repository }}.git" >> $GITHUB_ENV
+          fi
+      - run: |
+          julia --color=yes -e 'using Pkg; Pkg.add("BinaryBuilder")'
+          julia --color=yes .github/julia/build_tarballs.jl x86_64-linux-gnu-cxx11 --verbose --deploy="local"
+      # Now install a newer version of Julia to actually test HiGHS_jll. We
+      # choose v1.10 because it is the current Long-Term Support (LTS).
+      - uses: julia-actions/setup-julia@v2
+        with:
+          version: "1.10"
+          arch: x64
+      # We want to install the latest version of HiGHS.jl, but we also want it
+      # to be compatible with our newly compiled HiGHS_jll. To do so, we
+      # manually edit HiGHS.jl's Project.toml file to allow any v1.X.Y version
+      # of HiGHS_jll
+      - shell: julia --color=yes {0}
+        run: |
+          using Pkg
+          Pkg.develop("HiGHS")
+          project_filename = "/home/runner/.julia/dev/HiGHS/Project.toml"
+          project = read(project_filename, String)
+          write(
+            project_filename,
+            replace(project, r"HiGHS_jll = \"=.+?\"" => "HiGHS_jll = \"1\""),
+          )
+      # Now we can add HiGHS_jll and run the tests for HiGHS.
+      - shell: julia --color=yes {0}
+        run: |
+          using Pkg
+          Pkg.develop(; path="/home/runner/.julia/dev/HiGHS_jll")
+          Pkg.test("HiGHS")